7.81+6.29-12
用简便方法计算下面各题.3.8×6.7+3.3×3.81.28×0.29-0.29×0.28101×4.856×12.5....
用简便方法计算下面各题. 3.8×6.7+3.3×3.8 1.28×0.29-0.29×0.28 101×4.8 56×12.5.
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(1)3.8×6.7+3.3×3.8, =3.8×(6.7+3.3), =3.8×10, =38; (2)1.28×0.29-0.29×0.28, =0.29×(1.28-0.28), =0.29×1, =0.29; (3)101×4.8, =(100+1)×4.8, =100×4.8+1×4.8, =480+4.8, =484.8; (4)56×12.5, =7×(8×12.5), =7×100, =700.
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