简便运算我最行!
(1)101×51.8-1.25×51.8×0.8
(2)17.48×37-174.8×1.9+1.748×820.
解:(1)101×51.8-1.25×51.8×0.8,
=51.8×(101-1.25×0.8),
=51.8×(101-1),
=51.8×100,
=5180;
(2)17.48×37-174.8×1.9+1.748×820,
=17.48×37-17.48×19+17.48×82,
=17.48×(37-19+82),
=17.48×100,
=1748.
分析:(1)通过观察,此题可运用乘法分配律简算;
(2)原式可变为17.48×37-17.48×19+17.48×82,然后运用乘法分配律简算.
点评:仔细观察数字特点,灵活运用运算定律进行简算.