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用递等式计算,能简便计算的要用简便计算.①13×105-1890÷18②1.25×(0.8+19.2÷0.24)③716×9-7÷167④514÷[(56-38)×1011].

题目详情



7
16
×9-7÷
16
7

5
14
÷[(
5
6
-
3
8
)×
10
11
].
7
16
771616
16
7

5
14
÷[(
5
6
-
3
8
)×
10
11
].
16
7
161677
5
14
÷[(
5
6
-
3
8
)×
10
11
].
5
14
551414
5
6
-
3
8
)×
10
11
].
5
6
5566
3
8
)×
10
11
].
3
8
3388
10
11
].
10
11
10101111
▼优质解答
答案和解析
①13×105-1890÷18
=1365-105
=1260
②1.25×( 0.8+19.2÷0.24 )
=1.25×(0.8+80)
=1.25×0.8+1.25×80
=1×100
=100
7
16
×9-7÷
16
7

=
63
16
-
49
16

=
7
8

5
14
÷[(
5
6
-
3
8
)×
10
11
]
=
5
14
÷[(
20
24
9
24
)×
10
11
]
=
5
14
÷[
11
24
×
10
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=
5
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×
12
5

=
6
7
7
16
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16
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=
63
16
-
49
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=
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=
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