问题
解答题
计算下面各题,能简算的要用简便方法算. 667÷23×1125×77-37×2590.72÷7.2+5.3×81.25×7×3.2
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答案
(1)667÷23×11,
=29×11,
=319;
(2)25×77-37×25,
=25×(77-37),
=25×40,
=1000;
(3)90.72÷7.2+5.3×8,
=12.6+42.4,
=55;
(4)1.25×7×3.2,
=1.25×7×8×0.4,
=(1.25×8)×(7×0.4),
=10×2.8,
=28;
(5)
÷(9 8
+2.5×1 4
),2 5
=
÷(9 8
+1),1 4
=
÷19 8
,1 4
=
.9 10