a) (x-35) – 120 = 0
b) 310 – (118-x) = 217
c) 156 – (x+61) = 82
d) 814 – (x-305) = 712
e) 2x – 138 = 2 ³ . 3 ²
f) 20 – [7.(x-3) + 4] =2
g) [( 6x – 39) : 3] . 28 = 5628
h) 4x ³ + 12 = 120*
h) 4. (x-1) + [( 4750 – 2160) – (1750 – 1160)] = 3000
xin lỗi mn , em còn nhiêu đó điểm thôi ạ !!!
a) (x-35) – 120 = 0
x – 35 = 120
x = 155
b) 310 – (118-x) = 217
118 – x = 93
x = 25
c) 156 – (x+61) = 82
x + 61 = 74
x = 13
d) 814 – (x-305) = 712
x – 305 = 102
x = 407
e) 2x – 138 = 2 ³ . 3 ²
2x – 138 = 8 . 9
2x – 138 = 72
2x = 210
x = 105
f) 20 – [7.(x-3) + 4] =2
7 . ( x – 3 ) + 4 = 18
7 . ( x – 3 ) = 14
x – 3 = 2
x = 5
g) [( 6x – 39) : 3] . 28 = 5628
( 6x – 39) : 3 = 201
6x – 39 = 603
6x = 642
x = 107
h) 4x³ + 12 = 120
4x³ = 108
x³ = 27
x³ = 3³
x = 3
h) 4. (x-1) + [( 4750 – 2160) – (1750 – 1160)] = 3000
4 . ( x – 1 ) + ( 2590 – 1590 ) = 3000
4 . ( x – 1 ) + 2000 = 3000
4 . ( x – 1 ) = 1000
x – 1 = 250
x = 251
$a) (x-35) – 120 = 0$
$x – 35 = 0 + 120$
$x – 35 = 120$
$x = 120 + 35$
$x = 155$
$b) 310 – (118 – x) = 217$
$118 – x = 310 – 217$
$118 – x = 93$
$x = 118 – 93$
$x = 25$
$c) 156 – (x + 61) = 82$
$x + 61 = 156 – 82$
$x + 61 = 74$
$x = 74 – 61$
$x = 13$
$d) 814 – (x – 305) = 712$
$x – 305 = 814 – 712$
$x – 305 = 102$
$x = 102 + 305$
$x = 407$
$e) ) 2x – 138 = 2 ³ . 3 ²$
$2x – 138 = 8 . 9$
$2x – 138 = 72$
$2x = 72 + 138$
$2x = 210$
$x = 210 : 2$
$x = 105$
$f) 20 – [7.(x – 3) + 4] = 2$
$7.(x – 3) + 4 = 20 – 2$
$7.(x – 3) + 4 = 18$
$7.(x – 3) = 18 – 4$
$7.(x – 3) = 14$
$x – 3 = 14 : 7$
$x – 3 = 2$
$x = 2 + 3$
$x = 5$
$g) [(6x – 39) : 3] . 28 = 5628$
$(6x – 39) : 3 = 5628 : 28$
$(6x – 39) : 3 = 201$
$6x – 39 = 201.3$
$6x – 39 = 603$
$6x = 603 + 39$
$6x = 642$
$x = 642 : 6$
$x = 107$
$h) 4x ³ + 12 = 120$
$4x ³ = 120 – 12$
$4x³ = 108$
$x³ = 108 : 4$
$x³ = 27$
⇒ $x³ = 3³$
⇒ $x = 3$
$i) 4. (x-1) + [( 4750 – 2160) – (1750 – 1160)] = 3000$
$4. (x-1) + [(4750 – 1750) – (2160 – 1160)] = 3000$
$4. (x-1) + [3000 – 1000] = 3000$
$4. (x-1) + 2000 = 3000$
$4. (x-1) = 3000 – 2000$
$4. (x-1) = 1000$
$x-1 = 1000 : 4$
$x-1 = 250$
$x = 250 + 1$
$x = 251$
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