计算下面各题,能用简便算法的用简便算法 (1)2.3+3.91÷(22-19.7) (2)13.7×0.125×8 (
计算下面各题,能用简便算法的用简便算法(1)2.3+3.91÷(22-19.7)(2)13.7×0.125×8(3)18-(1.4+1.25×2.4)(4)2.65×1....
计算下面各题,能用简便算法的用简便算法 (1)2.3+3.91÷(22-19.7) (2)13.7×0.125×8 (3)18-(1.4+1.25×2.4) (4)2.65×1.7+1.35×1.7.
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(1)2.3+3.91÷(22-19.7),
=2.3+3.91÷2.3,
=2.3+1.7,
=4;
(2)13.7×0.125×8,
=13.7×(0.125×8),
=13.7×1,
=13.7;
(3)18-(1.4+1.25×2.4),
=18-(1.4+3),
=18-4.4,
=13.6;
(4)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8.
=2.3+3.91÷2.3,
=2.3+1.7,
=4;
(2)13.7×0.125×8,
=13.7×(0.125×8),
=13.7×1,
=13.7;
(3)18-(1.4+1.25×2.4),
=18-(1.4+3),
=18-4.4,
=13.6;
(4)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8.
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