问题 解答题
脱式计算.(能简算的要简算)
3
4
+
1
2
-
7
12
)×24
5
12
×
3
4
)×1
1
3
15
16
÷(
5
12
÷
5
8
+
3
8
1.25×38+125%×3-5÷4.
答案

(1)(

3
4
+
1
2
-
7
12
)×24,

=24×

3
4
+
1
2
×24-
7
12
×24,

=18+12-14,

=30-14,

=16;

(2)(

5
12
×
3
4
)×1
1
3

=

5
12
×(
3
4
×1
1
3
),

=

5
12
×1,

=

5
12

(3)

15
16
÷(
5
12
÷
5
8
+
3
8
),

=

15
16
÷(
2
3
+
3
8
),

=

15
16
÷
25
24

=

9
10

(4)1.25×38+125%×3-5÷4,

=1.25×38+1.25×3-1.25,

=1.25×(38+3-1),

=1.25×40,

=50.

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