问题
解答题
脱式计算,能简算的要简算.
99×0.625+0.625
88×125
72×125
250×13×4.
答案
(1)99×0.625+0.625
=(99+1)×0.625
=100×0.625
=62.5;
(2)88×125
=11×8×125
=11×(8×125)
=11×1000
=11000;
(3)72×125
=9×8×125
=9×(8×125)
=9×1000
=9000;
(4)250×13×4
=(250×4)×13
=1000×13
=13000.