题目内容
×[1÷(
-
)]
1.25×32×2.5
(3.8-1.8÷2)×0.5
×9-6÷
.
解:(1)
×{1÷(
-
)}
=
×{1÷(
-
)}
=
×{1÷
}
=
×8
=4
;
(2)1.25×32×2.5
=(1.25×8)×(4×25)
=10×100
=1000;
(3)(3.8-1.8÷2)×0.5
=(3.8-0.9)×0.5
=2.9×0.5
=1.45;
(4)
×9-6÷
=
×9-6×
=
×(9-6)
=
×3
=
=1
.
分析:根据分数的运算法则计算,先计算乘除再计算加减,有括号的要先算括号里的,再计算括号外的.
点评:此题主要考查的是分数或小数的四则混合运算及简便运算.
=
=
=
=4
(2)1.25×32×2.5
=(1.25×8)×(4×25)
=10×100
=1000;
(3)(3.8-1.8÷2)×0.5
=(3.8-0.9)×0.5
=2.9×0.5
=1.45;
(4)
=
=
=
=
=1
分析:根据分数的运算法则计算,先计算乘除再计算加减,有括号的要先算括号里的,再计算括号外的.
点评:此题主要考查的是分数或小数的四则混合运算及简便运算.
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