2.5×4.4=2.5×4×1.1运算的依据是乘法的分配律.
3.75×2.1+7.9×3.75
=3.75×(2.1+7.9)
=3.75×10
=37.5
3.75×101
=3.75×100+1
=375+1
=376
42×0.99
=42×1-42×0.01
=42-0.42
=41.58
3.7×1.4×0.05 12.5×0.4×2.5×8
3.2×2.5×0.125 12.9×101 4.3×2.4+2.4×5.7
22×0.24+2.2×2.6
6.9×101
11.43﹣(0.67+2.43)
12.5×3.2
7.7÷2.5÷0.7
36.7﹣3.02×4﹣7.92
①0.53×2.5+
②25×0.032×12.5
③ [()×]
④6.83+17.9﹣0.83+32.1
①25×32×1.25
②(+0.375)÷(×)
③×+÷7
④6﹣(+)
①26×15﹣200
②8×4×12.5×0.25
③×+
④12÷[()×]