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a) 2 . x - 138 = 23 . 32
2 . x - 138 = 72
2 . x = 138 + 72
2 . x = 210
x = 210 : 2
x = 105
\(a,2x-138=2^3\cdot3^2\)
\(2x-138=72\)
\(2x=72+138=210\)
\(x=210:2\)
\(x=105\)
\(b,231-\left(x-6\right)=1339:13\)
\(231-x+6=103\)
\(237-x=103\)
\(x=237-103\)
\(x=134\)
a) 2x - 138 = 23 . 32
=> 2x - 138 = 8 . 9
=> 2x - 138 = 72
=> 2x = 72 + 138
=> 2x = 210
=> x = 210 : 2
=> x = 105
b) 231 - ( x - 6 ) = 1339 : 13
=> 231 - ( x - 6 ) = 103
=> x - 6 = 231 - 103
=> x - 6 = 128
=> x = 128 + 6
=> x = 134
a) 2 . x - 138 = 23.32 b) 231 - (x -6) = 1339 : 13
2. x - 138 = 8 . 9 231 - (x -6 ) = 103
2 . x = 72 + 138 x - 6 = 231 - 103
2. x = 210 x - 6 = 128
x = 210 : 2 x = 128 + 6
x = 105 x = 134
vậy x = 105 vậy x = 134
a) 2.x-138=23.32 b) 231-(x-6)=1339:13
2.x-138=25=32 231-x+6=103
2.x=32+138 231-x=231-103
2.x=160 231-x=128
x=160:2 x=231-128
x=80 x=103
a)
2x - 138 = 23 . 32
=> 2x - 138 = 8 . 9
=> 2x - 138 = 72
=> 2x = 72 + 138
=> 2x = 210
=> x = 210 : 2
=> x = 105
Vậy x = 105
b)
231 - (x - 6) = 1339 : 13
=> 231 - (x - 6) = 103
=> x - 6 = 231 - 103
=> x - 6 = 128
=> x = 128 + 6
=> x = 134
Vậy x = 134
a) 2x-138=23.32
=>2x-138=8.9
=>2x-138=72
=>2x=72+138
=>2x=210
=>x=210:2
=>x=105
b)231-(x-6)=1339:13
=>231-(x-6)=103
=>x-6=231-103
=>x-6=128
=>x=128+6
=>x=134
a)\(2x-138=72\)
\(=>2x=210\)
\(=>x=210:2=105\)
b)\(231-\left(x-6\right)=103\)
\(=>\left(x-6\right)=231-103\)
\(=>\left(x-6\right)=128\)
\(=>x=128+6=134\)
a) 2x-138=23.32
2x-138=72
2x=72+138
2x=210
x=210/2
x=105
b)231-(x-6)=1339:13
231-(x-6)=103
(x-6)=231-103
x-6=128
x=128+6
x=134
a) 2 .x - 138 = 23 . 32
2.x - 138 = 8 . 9
2.x -138 = 72
2.x = 72 + 138
2.x =210
x = 210 : 2
x = 105
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b, (39. 42 - 37 . 42 ) : 42
= [ 42 ( 39 - 37 ) ] : 42
= 2 . 42 : 42
= 2
\(3^6:3^2+2^3.2^2=3^{6-2}+2^{3+2}\)
\(=3^2+2^5=9+32=41\)
\(\left(39.42-37.42\right):42=\left[42.\left(39-37\right)\right]:42\)
\(=\left(42.2\right):42=84:42=2\)
\(2x-138=2^3.3^2\Leftrightarrow2x-138=8.9\)
\(2x-138=72\Leftrightarrow2x=210\Leftrightarrow x=105\)
\(231-\left(x-6\right)=1339:13\Leftrightarrow231-\left(x-6\right)=103\)
\(\Leftrightarrow x-6=128\Leftrightarrow x=128+6\Leftrightarrow x=134\)
a, 36: 32+ 23.22
= 34+25
= 81+32
= 113
b, (39. 42- 37. 42) : 42
= (39-37).42/42
= 2 . ( 42/42)
= 2*1
=2
Bài 2: Tìm số tự nhiên x biết
a, 2.x - 138=23.32 b, 231- (x - 6) = 1339:13
2*x-138 = 8*9 231 - (x-6) =103
2*x-138 = 72 x - 6 = 128
2*x = 210 x = 134
x =105