题目内容

脱式计算.(能简算的要简算.)
2
7
÷
4
9
+
5
7
÷
4
9
120.8×2.75-0.8×2.75
32×
3
10
+1÷125%
63×(
2
7
-
1
72
)-0.125.
2
7
÷
4
9
+
5
7
÷
4
9

=
2
7
×
9
4
+
5
7
×
9
4

=(
2
7
+
5
7
)×
9
4

=
9
4


②120.8×2.75-0.8×2.75,
=2.75×(120.8-0.8),
=2.75×120,
=330;

③32×
3
10
+1÷125%,
=9.6+0.8,
=10.4;

④63×(
2
7
-
1
72
)-0.125,
=63×
2
7
-63×
1
72
-
1
8

=18-(
7
8
+
1
8
),
=18-1,
=17.
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