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a.X x 5 + X x4 = 36
X (5+4) = 36
X = 4
b. X x 4 - X x3 = 18
X (4-3) = 18
X = 18
X :0,2 + x X 4=36
X :2/10+x x 4=36
x x10/2+x x 4 =36
x x5 + x x4 =36
x x (4+5)=36
x x 9 =36
x=36:9
x=4
x :0.25 - x x 3 =18
x:25/100- x x 3=18
x x100/25- x x 3=18
x x 4- x x 3 =18
x x(4-3)=18
x x 1=18
x=18:1
x=18
a)
( x - 35 ) - 112 = 0
=> x - 35 = 0 + 112 = 112
=> x = 112 + 35 = 147
b)
124 + ( 118 - x ) = 27
=> 124 + 118 - x = 27
=> 242 - x = 27
=> x = 242 - 27 = 215
c)
156 - ( x + 61 ) = 82
=> 156 - x - 61 = 82
=> 95 - x = 82
=> x = 95 - 82 = 13
Bai 1 :
a/ \(x:1,4+2,8=8,4\)
\(x:1,4=8,4-2,8\)
\(x:1,4=5,6\)
\(x=5,6\times1,4\)
\(x=7,84\)
b/ \(2,8:x-1,5=2,3:5,75\)
\(2,8:x-1,5=\frac{2}{5}\)
\(2,8:x=\frac{2}{5}+1,5\)
\(2,8:x=\frac{19}{10}=1,9\)
\(\Rightarrow x=2,8:1,9=\frac{28}{19}\)
Bai 2 :
a/ \(575-\left(6\times x+70\right)=445\)
\(6\times x+70=575-445\)
\(6\times x+70=130\)
\(6\times x=130-70\)
\(\Rightarrow6\times x=60\Rightarrow x=10\)
b/ \(315+\left(125-x\right)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(\Rightarrow x=5\)
c/ \(\left(x-105\right):21=15\)
\(x-105=15\times21\)
\(x-105=315\)
\(\Rightarrow x=420\)
d/ \(3636:\left(12\times x-91\right)=36\)
\(12\times x-91=3636:36\)
\(12\times x-91=101\)
\(12\times x=101+91\)
\(12\times x=192\)
\(\Rightarrow x=16\)
e/ \(12\times\left(x-5\right)+73=20\)
\(12\times\left(x-5\right)=20-73\)
\(12\times\left(x-5\right)=-53\)
\(x-5=-53:12\)
\(x-5=\frac{-53}{12}\)
\(\Rightarrow x=\frac{-53}{12}+5\)
\(\Rightarrow x=\frac{7}{12}\)
f/ \(\left[\left(10-x\right)\times2+5\right]:3-2=3\)
\(\left[\left(10-x\right)\times2+5\right]:3=3+2\)
\(\left[\left(10-x\right)\times2+5\right]:3=5\)
\(\left[\left(10-x\right)\times2+5\right]=5\times3\)
\(\left(10-x\right)\times2+5=15\)
\(\left(10-x\right)\times2=15-5\)
\(\left(10-x\right)\times2=10\)
\(10-x=10:2\)
\(10-x=5\)
\(\Rightarrow x=5\)
\(a,\)\(124+\left(118-x\right)=365\)
\(118-x=365-124\)
\(118-x=241\)
\(x=118-241\)
\(x=\left(-123\right)\)
\(b,814-\left(x-305\right)=712\)
\(x-305=814-712\)
\(x-305=102\)
\(x=102+305\)
\(x=407\)
\(c,\)\(x-32\div16=48\)
\(x-2=48\)
\(x=48+2\)
\(x=50\)
\(d,\)\(\left(x-32\right):16=48\)
\(x-32=48.16\)
\(x-32=768\)
\(x=768+32\)
\(x=800\)
a) \(124+\left(118+x\right)=217\)
\(118+x=217-124\)
\(118+x=93\)
\(x=-25\)
vay \(x=-25\)
b) \(\left[\left(6x-72\right):2-84\right].28=5628\)
\(\left(6x-72\right):2-84=5628:28\)
\(\left(6x-72\right):2-84=201\)
\(\left(6x-72\right):2=201+84\)
\(\left(6x-72\right):2=285\)
\(6x-72=285.2\)
\(6x-72=570\)
\(6x=642\)
\(x=107\)
vay \(x-107\)
c) \(71.2-\left(2x+5\right).6=100\)
\(142-\left(2x+5\right).6=100\)
\(\left(2x+5\right).6=142-100\)
\(\left(2x+5\right).6=42\)
\(2x+5=7\)
\(2x=2\)
\(x=1\)
vay \(x=1\)
a, (X-35)-120=0
X-35 =120+0
X-35 =120
X =120+35
X =155
b,124+(118-X)=217
118-X =217-124
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
k cho mình đi rồi mình k lại cho
a,(x-35)-120=0
x-35=120
x=120+35
x=155
b,124+(118-x)
118-x=217-124
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
a) 124 + (118 - x) = 217
242 - x = 217
x = 242 - 217
x = 25
câu b nữa