Tính giá trị của biểu thức
a) a × 9 - 9 × b ; a = 157 ; b = 57
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b) b : c + 1256 ; b = 48128 , c = 8
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\(\left(y-958\right)\times4=1535\times4\\ =>y-958=1535\\ =>y=1535+958\\ =>y=2493\)
\(\left(y-958\right)\times4=\left(1207+328\right)\times4\\ =>\left(y-958\right)\times4=1535\times4\\ =>\left(y-958\right)=1535\\ =>y=1535+958\\ =>y=7098\)