计算下面各题,能用简便算法的用简便算法12.25-3.1+0.85-6.172.65×1.7+1.35×1.73.6÷(1.2+0.5)×50.125×0.38×8021.36÷0.8-12.9.
(1)12.25-3.1+0.85-6.17, =(12.25+0.85)-3.1-6.17, =13.1-3.1-6.17, =3.83; (2)2.65×1.7+1.35×1.7, =(2.65+1.35)×1.7, =4×1.7, =6.8; (3)3.6÷(1.2+0.5)×5, =3.6÷1.7×5, =
= 10
(4)0.125×0.38×80, =(0.125×80)×0.38, =10×0.38, =3.8; (5)21.36÷0.8-12.9, =26.7-12.9, =13.8. |
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