脱式计算.(能简算的用简算) (1)25×4.4 (2)7.7×0.16÷7.7×12.5 (3)10.64÷(3.7-2.9) (4)4.8×99+4.8 (5)47.3+21×(3.9-0.87)(6)5×[(68.41-32.17)÷
问题描述:
脱式计算.(能简算的用简算)
(1)25×4.4 (2)7.7×0.16÷7.7×12.5 (3)10.64÷(3.7-2.9)
(4)4.8×99+4.8 (5)47.3+21×(3.9-0.87)(6)5×[(68.41-32.17)÷0.4].
答
(1)25×4.4,=25×4+25×0.4,=100+10,=110;(2)7.7×0.16÷7.7×12.5,=7.7÷7.7×0.8×0.2×12.5,=1×0.2×12.5×0.8,=0.2×10,=2;(3)10.64÷(3.7-2.9),=10.64÷0.8,=13.3;(4)4.8×99+4.8,=4.8...