问题 解答题
[80-(20+4)-20]÷31÷1+0÷26+26÷1
(488×6+550×9)÷(6+9)200-(140-12×11)×16
0.186+(1
3
4
-
1
2
)-0.186-1
1
4
+45
24
6
23
÷6-
1
23
72×156-56×727.5-7.5×(7.5-7.5)÷7.5.
答案

(1)[80-(20+4)-20]÷3,

=[80-24-20]÷3,

=(56-20)÷3,

=36÷3,

=12;

(2)1÷1+0÷26+26÷1,

=1+0+26,

=27;

(3)(488×6+550×9)÷(6+9),

=(2928+4950)÷(6+9),

=7878÷15,

=525.2;

(4)200-(140-12×11)×16,

=200-(140-132)×16,

=200-8×16,

=200-128,

=72;

(5)0.186+(1

3
4
-
1
2
)-0.186-1
1
4
+45,

=0.186+1.25-0.186-1.25+45,

=(0.186-0.186)+(1.25-1.25)+45,

=0+0+45,

=45;

(6)24

6
23
÷6-
1
23

=(24+

6
23
)×
1
6
-
1
23

=24×

1
6
+
6
23
×
1
6
-
1
23

=4+

1
23
-
1
23

=4+(

1
23
-
1
23
),

=4+0,

=4;

(7)72×156-56×72,

=72×(156-56),

=72×100,

=7200;

(8)7.5-7.5×(7.5-7.5)÷7.5,

=7.5-7.5×0÷7.5,

=7.5-0,

=7.5.

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