9666-X=142-42
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a) y x 42 + y x 57 + y = 25 400
y x ( 42 + 57 + 1 ) = 25 400
y x 100 = 25 400
y = 25 400 : 100
y = 254
b) 142 x y - 41 x y - y = 408 000
y x ( 142 - 41 - 1 ) = 408 000
y x 100 = 408 000
y = 408 000 : 100
y = 4 080
a.y*(42+57+1)=25400
y*100=25400
y=25400:100=254
b.(142-41-1)*y=408000
100*y=408000
y=408000:100=4080
\(a,\Rightarrow x\times\left(42+54+4\right)=25400\\ \Rightarrow x\times100=25400\\ \Rightarrow x=254\\ b,\Rightarrow x\times\left(142-41-1\right)=40800\\ \Rightarrow x\times100=40800\\ \Rightarrow x=408\)
a) \(x\)(42+54+4)=15400 b) (142-41-1)\(x\)=10800
\(x\)x100=15400 100x\(x\)=10800
\(x\)=15400:100 \(x\)=10800:100
\(x\)=154 \(x\)=108
a) 142 x 12 + 42 x 18
= 142 x (12 +18)
= 142 x 30 = 4260
b) 49 x 365 - 39 x 365
= (49-39) x 365
= 10 x 365 = 3650
c) 4 x 18 x 25
= 18 x (4 x 25)
= 10 x 100 = 1800
\(\left(-151\right)+\left(-37\right)+\left(-42\right)+\left(-63\right)+142\)
\(=-151-37-42-63+142\)
\(=\left(-37-63\right)+\left(-151-42+142\right)\)
\(=-100-51\)
\(=-151\)
a.x-25=0+110
x+25=110
x=85
b.118-x=142-124
118-x=18
x=100
c.3x+22=124-42
3x+22=82
3x=88-22
3x=66
x=22
d.x-2=18
x=20
e.x-32=18.16
x-32=288
x=320
f.19-2x=294:42
19-2x=7
2x=19-7
2x=12
x=6
Dung thi k cho minh nha!!!
\(y+142+y-42+y-y=20800\)
\(\Leftrightarrow\)\(\left(3y-y\right)+\left(142-42\right)=20800\)
\(\Leftrightarrow\)\(2y+100=20800\)
\(\Leftrightarrow\)\(2y=20800-100=20700\)
\(\Rightarrow\)\(y=\frac{20700}{2}=10350\)
Vậy \(y=10350\)
a, 18.(-24) + 35.42 - 18.76 + 35.(-142)
= [ 18.(-24) - 18.76] + (35.42 + 35(-142)]
= -18.[ 24 + 76] - 35.( 142 - 42)
= -18.100 - 35. 100
= - 100.(18 + 35)
= - 100. 53
= - 5300
h, 104 : (-13) - [56 - 220 : (-4)]
= 104 : (-13) - [ 56 + 55]
= -8 - 111
= - 119
9666-X=142-42
9666 - x = 100
x = 9666 - 100
x = 9566
9666 - x = 142 - 42
9666 - x = 100
x = 9666 - 100
x = 9566