问题
解答题
计算下面各题,能用简便方法的要用简便方法计算.
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答案
(1)1.25×32×2.5,
=1.25×8×4×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100;
(2)7.54-0.9×6-2.36,
=7.54-5.4-2.36,
=2.41-2.36,
=0.05;
(3)10.1×3.4,
=(10+0.1)×3.4,
=34+0.34,
=34.34;
(4)8÷0.9÷4.1,
=8÷(0.9×4.1),
=8÷3.69,
=
;800 369
(5)7.28+27.2÷4,
=7.28+6.8,
=14.08;
(6)3.6×5.2+4.8×3.6,
=3.6×(5.2+4.8),
=3.6×10,
=36.