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toiyeuhocmai.com

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thangvegeta1604

a. 256−(x−42)=478
\Rightarrow −(x-42)=478-256
\Rightarrow -(x-42)=222
\Rightarrow -x+42=222
\Rightarrow -x=222-42
\Rightarrow -x=180\Rightarrow x=-180.
b. 25−(−34+x)=58
\Rightarrow -(-34+x)=58-25
\Rightarrow -(-34+x)=33
\Rightarrow 34-x=33
\Rightarrow x=33-34
\Rightarrow x=-1.
 
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giapvinh

a/256 − ( x − 42 ) = 478
x − 42 = 256 − 478
x − 42 = − 222
x = − 222 − 42
x = − 180

b/ 25 − ( − 34 + x ) = 58
− 34 + x = 25 − 58
− 34 + x = 33
x = 33 − 34
x = 1

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