7.9×9.9 64.8×100.1 97×0.4简便计算

问题描述:

7.9×9.9 64.8×100.1 97×0.4简便计算

(8-0.1)x(10-0.1)
(65-0.2)x(100+0.1)
(100-3)x(1-0.6)