问题补充说明:简算:3.14×9919.25-0.47-8.531.25×0.03×8720÷45.... 简算:3.14×99 19.25-0.47-8.53 1.25×0.03×8 720÷45. 展开
(1)3.14×99,
=3.14×(10便核卷管0-1),
=3.14×100-3.14,
=314-3.14,
=310.86;
来自(2)19.25-0.47-8.53,
=19.25-(0.47+8.53),
=19.25-9,
=10.25;
(3)1.25×0.03×8,
=0.03×(1.25×8),
=0.03×10,
=0.3;
(4)720÷45,
=720÷9÷5,
=80÷5,
=16.