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
9
8
÷(
1
4
+2.5×
2
5
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
÷(
1
4
+2.5×
2
5
),

=

9
8
÷(
1
4
+1),

=

9
8
÷1
1
4

=

9
10

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