0.1×0.2×0.3×0.4×0.5×0.6×0.7×0.8×0.9怎么巧算
2个回答
2017-09-17
展开全部
(1)1.2×0.4+1.3×0.4, =(1.2+1.3)×0.4, =2.5×0.4, =1; (2)(1.25+0.36)×0.2, =1.25×0.2+0.36×0.2, =0.25+0.072, =0.322; (3)7.2×0.3+28×0.03, =72×0.03+28×0.03, =(72+28)×0.03, =100×0.03, =3; (4)0.25×0.56×0.4, =0.25×0.4×0.56, =0.1×0.56, =0.056; (5)8×(2.5+0.125), =8×2.5+8×0.125, =20+1, =21; (6)0.25×0.56×0.4, =0.25×0.4×0.56, =0.1×0.56, =0.056; (7)32.8+5.6+7.2, =32.8+7.2+5.6, =40+5.6, =45.6; (8)75.2-66.9-5.2, =75.2-5.2-66.9, =70-66.9, =3.1.
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