7.5x一7.5x0.9,0.65x2.4一0.65x1.4,12.8+2.04x9.5脱式计算

2025-04-05 23:42:57
推荐回答(2个)
回答1:

1,解:原式=7.5x(1-0.9)
=7.5x0.1
=0.75
2,解:原式=0.65x(2.4-1.4)
=0.65x1
=0.65
3,解:原式=12.8+2.04x(10-0.5)
=12.8+2.04x10-2.04x0.5
=12.8+20.4-1.02
=33.2-1.02
=32.18

回答2:

(1)乘号后面少数.应该7.5×?-7.5×0.9
(2)原式=0.65×(2.4-1.4)=0.65×1=0.65
(3)原式=12.8+19.38=32.18