问题 解答题
用递等式计算.
16×125
1
3
×
1
9
÷
1
3
×
1
9
7.54-(2.54+3.12)
4
15
÷[(
5
7
-
3
14
)
÷
3
4
]
答案

(1)16×125,

=2×8×125,

=2×(8×125),

=2×1000,

=2000;

(2)

1
3
×
1
9
÷
1
3
×
1
9

=

1
3
×
1
9
×3×
1
9

=

1
81

(3)7.54-(2.54+3.12),

=7.54-2.54-3.12,

=5-3.12,

=1.88;

(4)

4
15
÷[(
5
7
-
3
14
)÷
3
4
],

=

4
15
÷[
1
2
×
4
3
],

=

4
15
÷
2
3

=

4
15
×
3
2

=

2
5

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