250 + 90 x 10 x 9 =?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
vì bài dài nên mk chỉ ghi kết quả thui nha
a,0
b,19
c,-54
d,17
e,-100
f,65
t,17
y,65
o,63
p,0
3,
a,-10
b,-100
1 Tính :
a)5+(-5)=0
b)71-25=46
c)28+(-82)=-54
d)47+(-30)=17
e)(-41)+(-59)=-100
f)75+(-10)=65
t)26-43=-17
y)90-25=65
o)72+(-9)=63
p)(-3)+3=0
2 Tính nhanh :
a)(-150)-47+150-53
=(-150+150)-47-53
=-100
b)250+(-90)-250-10+100
=(250-250)+(-90)-10+100
=0
c)71+92-28-(-29)+8-72
=71+92-28+29+8-72
=(71+29)+(92+8)-(28+72)
=100+100-100
=100
d)45+(-31)-45+(-31)
=(45-45)+(-31+-31)
=-62
3 Tìm x biết :
a)x-5=-15
x=-15+5
x=-10
b)21+x=-79
x=-79-21
x=-100
c)x-15=-23+(-6)
x-15=-29
x=-29+15
x=-14
d)200-x=/-32/-41
200-x=32-41
200-x=-9
-x=-9-200
-x=-209
=>x=209
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,250:\left(10-x\right)=25\\ \Rightarrow10-x=250:25\\ \Rightarrow10-x=10\\ \Rightarrow x=10-10=0\\ b,3x-2018:2=23\\ \Rightarrow3x-1009=23\\ \Rightarrow3x=23+1009\\ \Rightarrow3x=1032\\ \Rightarrow x=1032:3=344\\ c,\left(9x-21\right):3=2\\ \Rightarrow9x-21=2\times3\\ \Rightarrow9x-21=6\\ \Rightarrow9x=21+6\\ \Rightarrow9x=27\\ \Rightarrow x=27:9=3\)
\(d,53\left(9-x\right)=53\\ \Rightarrow9-x=53:53\\ \Rightarrow9-x=1\\ \Rightarrow x=9-1=8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1) Tính
a, 5 + (-5) = 0
b, 71 - 52 = 19
c, 28 + - (82) = -54
d, 45 + (-31) - 45 + (-30) = 45 + (-31) + (-45) + (-30) = [45 + (-45)] + [(-31) + (30)]
= 0 + (-1) = -1
2)Tìm x
a, x - 5 = -15
x = (-15) + 5
x = -10
b, 21 + x = -79
x = (-79) - 21
x = -100
c, x - 15 = -23 + (-6)
x - 15 = -29
x = -29 + 15
x = -14
d, 200 - x = /-32/ - 41
200 - x = 32 - 41
200 - x = -9
x = 200 - (-9)
x = 209
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( x - 25) x 17 = 34
=> x - 25 = 34 : 17
x - 25 = 2
=> x = 2 + 25
x = 27
145 + (150 - x) = 250
=> 150 - x = 250 - 145
150 - x = 105
=> x = 150 - 105
x = 45
(2x - 7) x 81 = 0
=> 2x - 7 = 0 : 81
2x - 7 = 0
=> 2x = 7
=> x = 7 : 2 = 3,5
x - 90 : 15 = 32
=> x - 6 = 32
=> x = 32 + 6
x = 38
520 - (x - 5) = 250 : 5
=> 520 - (x - 5) = 50
=> x - 5 = 520 - 50
x - 5 = 470
=> x = 470 + 5
x = 475
t i c k nhé!! 346457567684786896789
a ) \(\left(x-5\right).17=34\)
=> \(x-5=2\)
=> \(x=7\)
b ) \(145+\left(150-x\right)=250\)
=> \(150-x=105\)
=> \(x=150-105\)
=> \(x=45\)
c ) \(\left(2.x-7\right).81=0\)
=> \(2x-7=0\)
=> \(2x=7\)
=> \(x=\frac{7}{2}\)
d ) \(x-90:15=32\)
=> \(x-6=32\)
=> \(x=38\)
Mấy cái dấu chấm đó là nhân đó nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x\)x\(\frac{5}{9}+6=10\)
\(x\)x\(\frac{5}{9}=10-6\)
\(x\)x\(\frac{5}{9}=4\)
\(x=4:\frac{5}{9}\)
\(x=\frac{36}{5}\)
Mình nghĩ vậy
X x 5/9 + 6=10
X x5/9= 10 - 6
X x 5/9= 4
X = 4: 5/9
X = 36/5
200 + X : 1/4 = 206
X : 1/4 = 206 -200
X : 1/4 = 6
X = 6 x 1/4
X =3/2
X : 8/9 - 7 = 42
X: 8/9 = 42 - 7
X : 8/9 = 35
X = 35 x 8/9
X = 280/9
![](https://rs.olm.vn/images/avt/0.png?1311)
trường A có 125 HS dự thi
trường B có 125 HS dự thi...hên xui nhé
olm duyệt đi
250 + 90 x 10 x 9
= 250 + 900 x 9
= 250 + 8100
= 8350
250+90x10x9
=250+900x9
=250+8100
=8350