问题 解答题
脱式计算.(能简算的要简算)
5
18
÷[(
7
8
-
2
3
)×
4
5
]
16
7
×
5
8
-
2
7
÷
8
5

1.05×(3-0.9)÷6.3.
答案

(1)

5
18
÷[(
7
8
-
2
3
)×
4
5
]

=

5
18
÷[
5
24
×
4
5
]

=

5
18
÷
1
6

=

5
18
×6

=

5
3

(2)

16
7
×
5
8
-
2
7
÷
8
5

=

16
7
×
5
8
-
2
7
×
5
8

=(

16
7
-
2
7
)×
5
8

=2×

5
8

=

5
4

(3)1.05×(3-0.9)÷6.3

=1.05×2.1÷6.3

=1.05×(2.1÷6.3)

=1.05×

1
3

=0.35

多项选择题
辨析题