使用运算定律计算下面各题.210+24+90+76; &nb...

2024-11-01 14:51:58
推荐回答(1个)
回答1:

(1)210+24+90+76
=(210+90)+(24+76)
=300+100
=400

(2)23×27+23×73
=23×(27+73)
=23×100
=2300

(3)125×88
=125×8×11
=1000×11
=11000

(4)4×(75×25)
=4×25×75
=100×75
=7500

(5)985×101
=985×(100+1)
=985×100+985
=98500+985
=99485

(6)99×99+99
=99×(99+1)
=99×100
=9900.