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

2024-11-27 19:24:10
推荐回答(1个)
回答1:


(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
×3.14×9 2
=
1
3
×9 2 ×3.14,
=27×3.14,
=84.78.