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a/ x - ( 17 - x ) = x + 3
=> x - 17 + x = x + 3
=> 2. x - 17 = x + 3
=> 2. x - x = 3 + 17
=> x = 20
b/ - ( x + 12 ) + 35 = - 47
=> -x - 12 + 35 = -47
=> -x + 23 = -47
=> -x = -47 - 23 = -70
=> x = 70
c/ 15 - ( x + 32 ) = - 11
=> x + 32 = 15 - (-11) = 15 + 11 = 26
=> x = 26 - 32 = -6
c) \(47-\left(x-15\right)=21\)
\(\Leftrightarrow x-15=47-21\)
\(\Leftrightarrow x-15=26\)
\(\Leftrightarrow x=26+15=41\)
d) \(-5-\left(24-x\right)=-11\)
\(\Leftrightarrow24-x=-5+11\)
\(\Leftrightarrow24-x=6\)
\(\Leftrightarrow x=24-6=18\)
92 + 71 + 108 = (92 + 108) + 71 = 200 + 71 = 271
32 x 47 + 53 x 47 + 47 x 15 = 47(32 + 53 + 15)
= 47.100
= 4700
90 x 143 - 43 x 90 = 90.(143 - 43) = 90.100 = 9000
(1200 + 60) : 12 = 1800 : 12 = 150
2 x 18 x 24 + 3 x 50 x 16 + 12 x 32 x 4 = 18.(2.24) + 50.(3.16) + 32.(12.4) = 18.48 + 50.48 + 32.48 = 48(18 + 50 + 32) = 48.100 = 4800
Bài 2
a,17-(2+x)=3
(2+x)=17-3
(2+x)=14
x=14-2
x=12
b,Bạn ghi ^ là thế nào
Bài 1:
a)\(21.35-3.25=3.7.7.5-3.5.5=3.5.\left(7.7-5\right)=15.44=660\)
b) \(48.\left(-21\right)+\left(-142\right).\left(-24\right)\)
\(=\left(-2\right).\left(-24\right).\left(-21\right)+\left(-2\right).71.\left(-24\right)\)
\(=\left(-2\right).\left(-24\right).\left(-21+71\right)=48.50=2400\)
c)\(............\)
d)\(=47.\left(45-15-45-15\right)=47.\left(-30\right)=-1410\)
Bài 2:
a)\(17-\left(2+x\right)=3\\ =>2+x=14=>x=12\)
b) ko rõ đề
c)\(4x-15=-75-x\)
\(=>4x+x=-75+15\)
\(=>5x=-60=>x=-12\)
d)\(72-3x=5x+8\)
\(=>-3x-5x=8-72\)
\(=>-8x=-64=>x=8\)
e)\(2\left(x+1\right)+3.\left(x-2\right)=x-4\)
\(=>2x+2+3x-6=x-4\)
\(=>2x+3x-x=-4+6-2\)
\(=>4x=0=>x=0\)
CẬU CS THỂ THAM KHẢO BÀI ALMF TRÊN ĐÂY Ạ. HỌC TỐT NHA:>
\(-3+x=5-\left(-7\right)\)
\(\Leftrightarrow-3+x=5+7\)
\(\Leftrightarrow-3+x=12\)
\(\Leftrightarrow x=12+3\)
\(\Leftrightarrow x=15\)
Vậy x= 15
\(x-2=2x-7\)
\(\Leftrightarrow x-2+7=2x\)
\(\Leftrightarrow x-\left(2-7\right)=2x\)
\(\Leftrightarrow2-7=x-2x\)
\(\Leftrightarrow-5=-x\)
\(\Leftrightarrow x=5\)
Vậy x= 5
x - ( 17 - x ) = x + 3
<=> 2x - 17 = x + 3
<=> x = 20
Vậy x = 20
- ( x + 12 ) + 35 = - 47
<=> - x - 12 = - 47 -35
<=> x = 47 + 35 - 12
<=> x = 60
Vậy x = 60
15 - ( x + 32 ) = - 11
<=> 15 - x - 32 = - 11
<=> - x - 17 = - 11
<=> - x = - 11 + 17 = 6
<=> x = - 6
Vậy x = - 6
K chắc lắm
a)\(x-\left(17-x\right)=x+3\)
\(\Leftrightarrow x-17+x=x+3\)
\(\Leftrightarrow x+x-x=17+3\)
\(\Leftrightarrow x=20\)
b)\(-\left(x+12\right)+35=-47\)
\(\Leftrightarrow-x-12+35=-47\)
\(\Leftrightarrow-x=-47+12-35\)
\(\Leftrightarrow-x=-70\)
\(\Leftrightarrow x=70\)
c)\(15-\left(x+32\right)=-11\)
\(\Leftrightarrow15-x-32=-11\)
\(\Leftrightarrow-x=-11-15+32\)
\(\Leftrightarrow-x=6\)
\(\Leftrightarrow x=-6\)