问题 解答题
脱式计算.
0.25×1.25×4×8
2.125×
1
4
+1.875÷4
(2.5-0.125)×0.8+6.24
2
3
-
2
3
÷2
2.25×4.8+77.5×0.4836×(
2
9
+
7
12
答案

(1)0.25×1.25×4×8,

=(0.25×4)×(1.25×8),

=1×10,

=10;

(2)2.125×

1
4
+1.875÷4,

=(2.125+1.875)×

1
4

=4×

1
4

=1;

(3)(2.5-0.125)×0.8+6.24,

=2.5×0.8-0.125×0.8+6.24,

=2-0.1+6.24,

=8.14,

(4)2÷

2
3
-
2
3
÷2,

=2×

3
2
-
2
3
×
1
2

=3-

1
3

=2

2
3

(5)2.25×4.8+77.5×0.48,

=(22.5+77.5)×0.48,

=100×0.48,

=48;

(6)36×(

2
9
+
7
12
),

=36×

2
9
+36×
7
12

=8+21,

=29.

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