问题
解答题
|
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
)-0.186-11 2
+45,1 4
=0.186+1.25-0.186-1.25+45,
=(0.186-0.186)+(1.25-1.25)+45,
=0+0+45,
=45;
(6)24
÷6-6 23
,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.