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100 x 2 + ( 5 x 200 ) + 120 x 5
= 100 x 2 + 1000 + 120 x 5
= ( 100 x 2 ) + 1000 + ( 120 x 5 )
= 200 + 1000 + 600
= 1800
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\(a,\left(3x+5\right)+105=200\)
\(3x+5=95\)
\(3x=90\)
\(x=90:3\)
\(x=30\)
\(b,\left(x-4\right).\left(3x-15\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-4=0\\3x-15=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=4\\x=5\end{cases}}\)
\(c,\left(72000+18000\right)-\left(3x+3000\right)=1200\)
\(90000-\left(3x+3000\right)=1200\)
\(3x+3000=88800\)
\(3x=85800\)
\(x=28600\)
\(d,\left[3.\left(2+x\right):7\right].4=120\)
\(3.\left(2+x\right):7=30\)
\(3.\left(2+x\right)=210\)
\(2+x=70\)
\(x=68\)
\(e,2480-4710:3+\left[200-\left(x-5\right)\right]=1010\)
\(2480-1570+\left(200-x+5\right)=1010\)
\(910+\left(205-x\right)=1010\)
\(205-x=100\)
\(x=105\)
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[-120 + ( 200 - 465 ) - (-265 + 200 - 120)] : (-5)
= -120 + -265 - -145 : (-5)
= -385 - -140
= -245
Hk tốt
[ -120 + ( 200- 465) - ( - 265+ 200- 120)] / ( -5)
= [ -120 + 200- 465 + 265 - 200+ 120] / (-5)
= [ ( -120)+ 120 + (200-200) + (465 - 265)] / (-5)
= [ 0 + 0 + 100] / (-5)
= 200 / (-5)
= -40
k cho mik nha
**** Chúc bạn học tốt****
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1)
a) 2x + 5 = 3⁴ : 3²
2x + 5 = 3²
2x + 5 = 9
2x = 9 - 5
2x = 4
x = 4 : 2
x = 2
b) (3x - 24).73 = 2.74
(3x - 24).73 = 148
3x - 24 = 148/73
3x = 148/73 + 24
3x = 1900/73
x = 1900/73 : 3
x = 1900/219
c) [3.(42 - x)] + 15 = 23.3
126 - 3x + 15 = 69
141 - 3x = 69
3x = 141 - 69
3x = 72
x = 72 : 3
x = 24
d) 126 + (132 - x) = 300
132 - x = 300 - 126
132 - x = 174
x = 132 - 174
x = -42
2)
a) 120 - (x + 55) = 60
x + 55 = 120 - 60
x + 155 = 60
x = 60 - 55
x = 5
b) (7x - 11).3 = 25.52 + 200
(7x - 11).3 = 1500
7x - 11 = 1500 : 3
7x - 11 = 500
7x = 500 + 11
7x = 511
x = 511 : 7
x = 73
c) 2x + 2x + 4 = 544
4x = 544 - 4
4x = 540
x = 540 : 4
x = 135
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198-(x+4)=120
\(\Leftrightarrow\)198-x-4=120
\(\Leftrightarrow\)-x-4=-78
\(\Leftrightarrow\)-x=-74
\(\Leftrightarrow\)x=74
x+4= 198 - 120
x+4= 78
x= 78-4
x=74
Vậy x= 74
2x(x-51) = 2 x 2^3 + 20
2x( x-51) = 2 x 8+ 20
2x(x-51) = 16+20
2x- (x-51) = 36
2x-x+51= 36
x+ 51= 36
x= 51-36
=15
Vậy x=15
phần cuối làm giống phần đầu tiên, bn tự giải nha, nhớ k cho mk nhé!!!!^_^~~~~~~~~~~~~~~~~~~~
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23.27.24=23+7+4=214
23.24:25=23+4-5=27
(-3)+(-125)+(-25)
=-128+(-25)
=-153
25+(-38)=25-38=-13
126+159=285
120+(-135)+200
=120-135+200
=-15+200
=185
2^3x2^7=2^10x2^4=2^14=16384
2^3x2^4=2^7:2^5=2^2=4
1300-(150.2+(900+90):9)=1300-(150.2+990:9)=1300-(300+11)=1300-311=989
(-3) + (-125)+(-25)= -(3+125+25)= -153
25 + (-38)= -(38-25)= - 13
(126)+159=285
(120)+(-135)+200= -(135-120) + 200= (-15) + 200= +(200-15)=185
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a,(72000+18000)-(3x+3000)=12000
90000-(3x+3000)=12000
3x+3000=90000-12000
3x+3000=78000
3x=78000-3000
3x=75000
x=75000:3
x=25000
b,[3.(x+2):7]:4=120
3.(x+2):7=120:4
3.(x+2):7=30
3.(x+2)=30.7
3.(x+2)=210
x+2=210:3
x+2=70
x=70-2
x=68
120+5(x-4)=200
5(x-4)=200-120
5(x-4)=80
(x-4)=80:5
x-4 =16
x =16+4
x =20
120 + 5( x - 4 ) = 200
5 . 24 + 5( x - 4 ) = 5.40
5( x - 4 ) = 5.40 - 5 . 24
5( x - 4 ) = 5.( 40 - 24 )
5( x - 4 ) = 5. 16
\(\Rightarrow\) x - 4 = 16
\(\Rightarrow\) x = 16 + 4 = 20
Vậy x = 20