计算下面各题,能用简便算法的用简便算法(1)12.25-3.1+0.85-6.17 (2)(1.9-1.9×0.9)÷(3.8-2.8)

计算下面各题,能用简便算法的用简便算法(1)12.25-3.1+0.85-6.17 (2)(1.9-1.9×0.9)÷(3.8-2.8) (3)2.65×1.7+1.35×1.7 (4)0.125×13.8×32×0.25.

(1)12.25-3.1+0.85-6.17
=12.25+0.85-3.1-6.17
=13.1-3.1-6.17
=10-6.17
=3.83;

(2)(1.9-1.9×0.9)÷(3.8-2.8)
=(1.9-1.71)÷(3.8-2.8)
=0.19÷1
=0.19;

(3)2.65×1.7+1.35×1.7
=(2.65+1.35)×1.7
=4×1.7
=6.8;

(4)0.125×13.8×32×0.25
=0.125×8×(4×0.25)×13.8
=1×1×13.8
=13.8.

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