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(x-1分之x)的平方+6=5(x-1分之x) (x-1分之x)²;-5(x-1分之x)+6=0 (x-1分之x -2)(x-1分之x -3)=0 x-1分之x=2或x-1分之x=3 x1=2,x2=1.5(不合題意) ∴整數解x=2
x×(1+15%)=23 1.15x=23 x=23÷1.15 x=20
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