问题 解答题
计算:
(1)(1-
1
4
÷
3
8
7
9

(2)3-1.5×
10
21
-
2
7
答案

(1)(1-

1
4
÷
3
8
7
9

=(1-

2
3
)÷
7
9

=

1
3
×
9
7

=

3
7

(2)3-1.5×

10
21
-
2
7

=3-

5
7
-
2
7

=3-(

5
7
+
2
7
),

=3-1,

=2.

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