问题 解答题
选择合适的方法计算.
56×(
2
7
+
5
8
)-22
40%×38+12×
2
5
2-
2
9
-
7
9
23000÷(125×23)
4.55-1.8-1.2+5.45198+736+802+164.
答案

(1)56×(

2
7
+
5
8
)-22,

=56×

2
7
+56×
5
8
-22,

=16+35-22,

=51-22,

=29;

(2)40%×38+12×

2
5

=0.4×38+12×0.4,

=0.4×(38+12),

=0.4×50,

=20;

(3)2-

2
9
-
7
9

=2-(

2
9
+
7
9
),

=2-1,

=1;

(4)23000÷(125×23),

=23000÷125÷23,

=23000÷23÷125,

=1000÷125,

=8;

(5)4.55-1.8-1.2+5.45,

=(4.55+5.45)-(1.8+1.2),

=10-3,

=7;

(6)198+736+802+164,

=(198+802)+(736+164),

=1000+900,

=1900.

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