问题 解答题
计算下面各题,能简算的要简算
17.8-8.75+2.2-1.25
0.125×32×2.5
4
7
+
7
8
+
3
7
+
1
8

4
7
+(
17
24
-
4
7
答案

①17.8-8.75+2.2-1.25,

=(17.8+2.2)-(8.75+1.25),

=20-10,

=10;

②0.125×32×2.5,

=(0.125×8)×(4×2.5),

=1×10,

=10;

4
7
+
7
8
+
3
7
+
1
8

=(

4
7
+
3
7
)+(
7
8
+
1
8
),

=1+1,

=2;

4
7
+(
17
24
-
4
7
),

=

4
7
-
4
7
+
17
24

=

17
24

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