题目内容

脱式计算,能简算的要简算.

①480-48+124
②1.25×3.2×0.25③(
7
23
+
1
3
)×3+
2
23
④(
2
3
-
2
5
)×30
⑤3.45÷[0.3×(2.3-1.8)]
2
3
×[(
1
3
-
1
5
)÷
4
5
].
(1)480-48+124,
=432+124,
=556;

(2)1.25×3.2×0.25,
=(1.25×8)×(0.4×0.25),
=10×0.1,
=1;

(3)(
7
23
+
1
3
)×3+
2
23

=
7
23
×
3+
1
3
×
3+
2
23

=(
21
23
+
2
23
)+1,
=1+1,
=2;

(4)(
2
3
-
2
5
)×30,
=
2
3
×
30-
2
5
×
30,
=20-12,
=8;

(5)3.45÷[0.3×(2.3-1.8)],
=3.45÷[0.3×0.5],
=3.45÷0.15,
=23;

(6)
2
3
×[(
1
3
-
1
5
)÷
4
5
],
=
2
3
×
[
2
15
÷
4
5
],
=
2
3
×
1
6

=
1
9
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