问题 解答题
脱式计算(能简算的简算).
1
8
+
5
12
-
1
6
)×48
1.25×64×2.5×0.5
693×99+693
9
20
÷[
1
2
×(
2
5
+
4
5
)].
答案

(1)(

1
8
+
5
12
-
1
6
)×48,

=

1
8
×48+
5
12
×48-
1
6
×48,

=6+20-8,

=18;

(2)1.25×64×2.5×0.5,

=1.25×8×4×2×2.5×0.5,

=1.25×8×(4×2.5)×(2×0.5),

=10×10×1,

=100;

(3)693×99+693,

=(99+1)×693,

=100×693,

=69300;

(4)

9
20
÷[
1
2
×(
2
5
+
4
5
)],

=

9
20
÷[
1
2
×
6
5
],

=

9
20
÷
3
5

=

9
20
×
5
3

=

3
4

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