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脱式计算.25×4×3.2 32×3.2×0.7 4.4×0.4×0.42×0.7×3.3 0.125×32×2.5.

编辑:chaxungu时间:2026-04-26 09:30:40分类:小学数学题库

脱式计算.
25×4×3.2     
32×3.2×0.7     4.4×0.4×0.4
2×0.7×3.3               0.125×32×2.5.
解:
(1)25×4×3.2
=100×3.2
=320;
(2)32×3.2×0.7
=102.4×0.7
=71.68;
(3)4.4×0.4×0.4
=1.76×0.4,
=0.704;
(4)2×0.7×3.3
=1.4×3.3
=4.62;
(5)0.125×32×2.5
=0.125×(8×4)×2.5
=(0.125×8)×(4×2.5)
=1×10
=10.

分析:(1)(2)(3)(4)按运算顺序从左往右依次计算;
(5)将0.125×32×2.5变形为0.125×(8×4)×2.5,再根据乘法结合律简便计算.
点评:此题考查了数的脱式计算,特别注意运算顺序和运算法则,以及运算律的灵活运用.