题目内容

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
)].
(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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