问题
解答题
脱式计算,能简算的要简算.
(125+7)×8=______;
3.27+6.4+2.73+4.6=______;
25×44=______;
6.45-0.58-1.42=______.
答案
(1)(125+7)×8,
=125×8+7×8,
=1000+56,
=1056;
(2)3.27+6.4+2.73+4.6,
=(3.27+2.73)+(6.4+4.6),
=6+11,
=17;
(3)25×44,
=25×4×11,
=100×11,
=1100;
(4)6.45-0.58-1.42,
=6.45-(0.58+1.42),
=6.45-2,
=4.45.