x (1+1/10)(1-1/10)=49.5则么算?
问题描述:
x (1+1/10)(1-1/10)=49.5则么算?
答
x (1+1/10)(1-1/10)=49.5
x=50中间的计算过程是设么??x (1+1/10)(1-1/10)=49.5 平方差公式x(1-1/100)=49.5x=49.5/99/100=4950/99=50