题目内容

计算下面各题,能简算的要简算.
①(
6
7
-
5
6
)÷
1
42
7
10
×3+
3
10
÷
1
3
5
8
+
3
7
+
3
8
+
4
7
④3-
3
2
×
10
21
-
2
7
2
7
×
3
9
÷
2
7
×
3
9
⑥28×
26
27
①(
6
7
-
5
6
)÷
1
42

=(
6
7
-
5
6
)×42,
=
6
7
×42-
5
6
×42,
=36-35,
=1;

7
10
×3+
3
10
÷
1
3

=
7
10
×3+
3
10
×3,
=(
7
10
+
3
10
)×3,
=1×3,
=3;

5
8
+
3
7
+
3
8
+
4
7

=(
5
8
+
3
8
)+(
3
7
+
4
7
),
=1+1,
=2;

④3-
3
2
×
10
21
-
2
7

=3-
5
7
-
2
7

=3-(
5
7
+
2
7
),
=3-1,
=2;

2
7
×
3
9
÷
2
7
×
3
9

=
2
7
×
3
9
×
7
2
×
3
9

=
2
7
×
7
2
×
3
9
×
3
9

=
1
9


⑥28×
26
27

=(27+1)×
26
27

=27×
26
27
+
26
27

=26+
26
27

=26
26
27
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