计算各题,能简便的要用简便方法计算.1.25×25×3.24.75+0.25×1521×(1-37)÷31615.75-(235+534)(6×23-4)÷4579÷115+29×511.-数学
题文
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答案
(1)1.25×25×3.2, =(1.25×0.8)×(25×4), =1×100, =100; (2)4.75+0.25×
=4.75+0.05, =4.8; (3)21×(1-
=21×
=64; (4)15.75-(2
=15.75-5.75-2.6, =10-2.6, =7.4; (5)(6×
=(4-4)÷
=0÷
=0; (6)
=(
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