问题 解答题
用递等式计算(能简算的要简算)
1650-480÷16×15

0.4×7.6×25×100
1
3
-
1
5
)×45
20-(11.9-8.4×
1
7
答案

(1)1650-480÷16×15,

=1650-30×15,

=1650-450,

=1200;

(2)0.4×7.6×25×100,

=(0.4×25)×(7.6×100),

=10×760,

=7600;

(3)(

1
3
-
1
5
)×45,

=

1
3
×45-
1
5
×45,

=15-9,

=6;

(4)20-(11.9-8.4×

1
7
),

=20-(11.9-1.2),

=20-10.7,

=9.3.

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