同圆或等圆的直径相等. .
3.14×0.68+31.4×0.032.
计算:16×25×32×125= .
计算:667+458+345+542+333= .
计算:25×34×32×125= .
计算: (1)625×32= ; (2)1+2+3+4+5+6+…+49+50+49+…+13+12+11= .