问题 解答题
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
答案

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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