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a, (17x-25):8=81-65
(17x-25):8=16
17x-25=16:8
17x-25=2
17x=2+25
17x=27
x=27:17
x=27/17
b,720:[41-(2x-5)]=40
41-(2x-5)=720:40
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=23+5
2x=28
x=28:2
x=14
c,231-(x-6)=103
x-6=231-103
x-6=128
x=128+6
x=134
XEM LẠI GIÙM MÌNH BẠN NHA!
đề bài: (17x-25):8+65= 81
(17x-25):8=81-65=16
17x-25= 16 . 8= 128
17x = 128+25=153
x = 153:17=9
b, Đề bài 720:[41-(2x-5)]=8.5
720:[41-(2x-5)]=40
41-(2x-5)=720:40=18
2x-5=41-18=23
2x = 23+5=28
x = 28:2= 14
c, 231-(x-6)=1339:13=103
x-6=231-103=128
x= 128 + 6= 134
Đúng thì **** bạn
a) 2 * x - 138 = 8 * 9
2 * x - 138 = 72
2 * x = 210
x = 105
b) 231 - ( x - 6 ) = 1339 : 13
231 - x + 6 = 103
237 - x = 103
x = 134
c) 70 - 5 * ( x-3) = 45
5 * (x-3) = 25
x - 3 = 5
x = 8
cac phan con lai bn lm tuong tu nha
* 2*X-138=8*9
<=> 2*X-138=72
<=> 2*X=72+138
<=> 2*X=210
<=> X=210/2=105
*231-(X-6)=1339:13
<=> 231-(X-6)=103
<=> X-6=231-103
<=>X-6=128
<=>X=128+6=134
*70-5*(X-3)=45
<=>5*(X-3)=70-45
<=>5*(X-3)=25
<=>X-3=25/5
<=>X-3=5
<=>X=8
*10+2*X=16
<=>2*X=16-10
<=>2*X=6
<=>X=6/2=3
a)13/17 < 15/19
a) 2/3 x X + 3/4 = 3
2/3 x X = 3 - 3/4
2/3 x X = 9/4
X = 9/4 : 2/3
X = 27/8
a. Ta có : \(\frac{13}{17}=\frac{247}{323};\frac{15}{19}=\frac{255}{323}\)
Vì 255 > 247 nên 247/323 < 255/323
Hay \(\frac{13}{17}< \frac{15}{19}\)
b. \(\frac{2}{3}\times x+\frac{3}{4}=3\)
\(\frac{2}{3}\times x=3-\frac{3}{4}\)
\(\frac{2}{3}\times x=\frac{9}{4}\)
\(x=\frac{9}{4}:\frac{2}{3}\)
\(x=\frac{27}{8}\)
c. \(720:\left[41-\left(2\times x-5\right)\right]=120\)
\(\left[41-\left(2\times x-5\right)\right]=720:120\)
\(41-\left(2\times x-5\right)=6\)
\(2\times x-5=35\)
\(2\times x=40\)
\(x=20\)
a)= ( 81 , 6 x 27 , 3 – 17 , 3 x 81 , 6 ) x 0
=0 ( vì 0 nhân với số nào cũng bằng 0)
b)= ( 13 , 75 – 0 , 48 x 5 ) x ( 42 , 75 : 3 + 2 , 9 ) x ( 9-9)
= ( 13 , 75 – 0 , 48 x 5 ) x ( 42 , 75 : 3 + 2 , 9 ) x 0
= 0 ( vì 0 nhân với số nào cũng bằng 0)
c)=( 792 , 81 x 0 , 25 + 792 , 81 x 0 , 75 ) x 0
=0 ( vì 0 nhân với số nào cũng bằng 0 )
a ) ( 81 , 6 x 27 , 3 – 17 , 3 x 81 , 6 ) x ( 32 x 11 - 3200 x 0 , 1 - 32 )
= ( 81 , 6 x 27 , 3 – 17 , 3 x 81 , 6 ) x ( 352 - 320 - 32 )
= ( 81 , 6 x 27 , 3 – 17 , 3 x 81 , 6 ) x 0
= 0.
b ) ( 13 , 75 – 0 , 48 x 5 ) x ( 42 , 75 : 3 + 2 , 9 ) x ( 1 , 8 x 5 – 0 , 9 x 10 )
= ( 13 , 75 – 0 , 48 x 5 ) x ( 42 , 75 : 3 + 2 , 9 ) x ( 9 - 9 )
= ( 13 , 75 – 0 , 48 x 5 ) x ( 42 , 75 : 3 + 2 , 9 ) x 0
= 0
c ) ( 792 , 81 x 0 , 25 + 792 , 81 x 0 , 75 ) x ( 11 x 9 – 900 x 0 , 1 – 9 )
= ( 792 , 81 x 0 , 25 + 792 , 81 x 0 , 75 ) x ( 99 - 90 - 9 )
= ( 792 , 81 x 0 , 25 + 792 , 81 x 0 , 75 ) x 0
= 0.
Hok tốt !
231 - ( y-6) = 1339 : 13
231 - ( y-6 ) = 103
y - 6 = 231 -103 =128
y = 128 + 6 134
231- (y-6) = 1339 : 13
=> 231 - (y-6) = 103
=> y- 6 = 231 - 103 = 128
=> y = 128 + 6
=> y = 134
Bai 1 :
27 x 36 + 27 x 45 - 27
= 27 x 36 + 27 x 45 - 27 x 1
= 27 x ( 36 + 45 - 1 )
= 27 x 80
= 21260
Bai 2 :
a) 720 : [ 41 - ( 2 . x - 5 ) ] = 120
41 - ( 2 . x - 5 ) = 720 : 120
41 - ( 2 . x - 5 ) = 6
2 . x - 5 = 41 - 6
2 . x - 5 = 35
2 . x = 35 + 5
2 . x = 40
x = 40 : 2
x = 20
b) ( 3,7 : x - 13 ) x 0,2 - 1,4 = 10,8
( 3,7 : x - 13 ) x 0,2 = 10,8 + 1,4
( 3,7 : x - 13 ) x 0,2 = 12,2
3,7 : x - 13 = 12,2 : 0,2
3,7 : x - 13 = 61
3,7 : x = 61 + 13
3,7 : x = 74
x = 74 : 3,7
x = 20
a.27x36+27x45-27
=27x(36+45-1)
=27x80
=2160
a. 720:[41-(2*x-5)]=120
41-(2*x-5)=720:120=6
2*x-5=41-6=35
2*x=35+5=40
x=40:2=20
Vậy x=20
b. (3,7:x-13)x0,2-1,4=10,8
(3,7:x-13)x0,2=10,8+1,4=11,2
3,7:x-13=11,2:0,2=56
3,7:x=56+13=69
x=3,7:69=\(\frac{37}{690}\)
a , 231 - (X - 6) = 169 : 13
231 - (X - 6) = 13
231 - 13 = X + 6
218 = X - 6
X = 218 +6
X = 224
b , 3 x X + 5 x X = 4 x 8
3 x X +5 x X = 32
(3 + 5) x X = 32
8 x X = 32
X = 32 : 8
X = 4
c , (X + 1) + (X + 3) (X + 5) + ... + (X + 19) = 197
X + (1 + 3 + 5 + ...+ 19) = 197
X + 100 = 197
X = 197 - 100
X = 97
a)231-(x-6)=169:13
231-(x-6)=13
231-13 =x-6
218 =x-6
x = 218+6
x =224
b)3xX+5xX=4x8
(3+5)xX = 32
X=32:8
X=4
c)
720 : [ 41 - ( 2 x x -5 ) =120
41 - ( 2 x x - 5 ) = 720 : 120
41 - ( 2 x \(x\) -5 ) =6
2 x \(x\) -5 = 41 - 6
2 x \(x\) - 5 = 35
2 x \(x\) = 35+5
2 x \(x\)=40
\(x\) = 40 : 2 = 20
Vậy x = 20
Ủng hộ nhé ^^
720 : [ 41 - ( 2 x X - 5 ) ] = 120
41 - ( 2 x X - 5 ) = 720 : 120
41 - ( 2 x X - 5 ) = 6
2 x X - 5 = 41 - 6
2 x X - 5 = 35
2 x X = 35 - 5
2 x X = 30
X = 30 : 2
X = 15
Học tốt nhé bạn !
\(a.\left(17x-25\right)\div8+65=81\)
\(\left(17x-25\right):8=81-65\)
\(\left(17x-25\right):8=16\)
\(17x-25=16\times8\)
\(17x-25=128\)
\(17x=128+25\)
\(17x=153\)
\(x=153\div17\)
\(x=9.\)
\(b.720\div\left[41-\left(2x-5\right)\right]=8\times5\)
\(720\div\left[41-\left(2x-5\right)\right]=40\)
\(\left[41-\left(2x-5\right)\right]=720\div40\)
\(\left[41-\left(2x-5\right)\right]=18\)
\(2x-5=41-18\)
\(2x-5=23\)
\(2x=23+5\)
\(2x=28\)
\(x=28\div2\)
\(x=14.\)
\(c.231-\left(x-6\right)=1339\div13\)
\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x=128+6\)
\(x=134.\)
a) => ( 17x-25 ) : 8 = 16 => ( 17x -25 ) = 128 => 17x = 103 = >x = 103/7