问题 解答题
脱式计算,能简算的要简算
8
21
×
7
9
+
10
21
÷
9
7

(0.75-
3
16
)×(
2
9
+
1
3

18
35
÷0.6×
2
3

1
3
×3.14×92
答案

(1)

8
21
×
7
9
+
10
21
÷
9
7

=

8
21
×
7
9
+
10
21
×
7
9

=(

8
21
+
10
21
)×
7
9

=

18
21
×
7
9

=

2
3

(2)(0.75-

3
16
)×(
2
9
+
1
3
),

=

9
16
×
5
9

=

5
16

(3)

18
35
÷0.6×
2
3

=

6
7
×
2
3

=

4
7

(4)

1
3
×3.14×92

=

1
3
×92×3.14,

=27×3.14,

=84.78.

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