加法交换律简便计算题目简.doc

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简便计算的方法:? 0.25×8.5×4??????12.5×0.96×0.8????????0.25×0.73×4??????????4.36×12.5×8????? 0.25×16.2×4??????1.25×2.5×32?????????3.2×0.25×12.5??????????0.25×36??? (1.25-0.125)×8??????????4.8×10.1??????????3.6×102???????????0.39×199??????????????? ?0.32×403?????????3.65×10.1???????0.85×9.9??????3.72×3.5+6.28×3.5??????????? 15.6×2.1-15.6×1.1??????????4.8×7.8+78×0.52???????????56.5×99+56.5??????? 7.09×10.8-0.8×7.09??????1.87×9.9+0.187??????????4.2×99+4.2????????????? 3.8×4.56+3.83×5.44?????????9.7×99+9.7????????27.5×3.7-7.5×3.7????? ??????????????????????????????? 3.14×0.68+31.4×0.032?????????7.2×0.2+2.4×1.4?????????5.4×11-5.4?? ?????????? 7.74×(2.8-1.3)+1.5×2.26?????3.9×2.7+3.9×7.3????????12.7×9.9+1.27???? ?2.3×16+2.3×23+2.3????????????3.65×4.7??-36.5×0.37???101×0.87-0.91×87????? 46×57+23×86???????????10.7×16.1-15.1×10.7????????7.6×0.8+0.2×7.6??? ????????????????????????????? 1.28×8.6+0.72×8.6?????10.6×0.35-9.6×0.35????8.9×1.01??????0.65×101?????? 48×0.56+44×0.48????0.279×343+0.657×279???0.264×519+264×0.481?????? ?9.16×1.53-0.053×91.6????0.125×96????12.5×10.8???(20-4)×0.25? ? ?? 45×21-50×2.1??????45×1.58+5.5×15.8?????????25×7.3×0.4? 0.25×8.5×4??????12.5×0.96×0.8????????0.25×0.73×4??????????4.36×12.5×8????? 0.25×16.2×4??????1.25×2.5×32?????????3.2×0.25×12.5??????????0.25×36??? (1.25-0.125)×8??????????4.8×10.1??????????3.6×102???????????0.39×199??????????????? ?0.32×403?????????3.65×10.1???????0.85×9.9??????3.72×3.5+6.28×3.5??????????? 15.6×2.1-15.6×1.1??????????4.8×7.8+78×0.52???????????56.5×99+56.5??????? 7.09×10.8-0.8×7.09??????1.87×9.9+0.187??????????4.2×99+4.2????????????? 3.8×4.56+3.83×5.44?????????9.7×99+9.7????????27.5×3.7-7.5×3.7????? ??????????????????????????????? 3.14×0.68+31.4×0.032?????????7.2×0.2+2.4×1.4?????????5.4×11-5.4?? ?????????? 7.74×(2.8-1.3)+1.5×2.26?????3.9×2.7+3.9×7.3????????12.7×9.9+1.27???? ?2.3×16+2.3×23+2.3????????????3.65×4.7??-36.5×0.37???101×0.87-0.91×87????? 46×57+23×86???????????10.7×16.1-15.1×10.7????????7.6×0.8+0.2×7.6??? ?????

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