(1)3.875×(10.3-0.775)÷318×831(2)5.42-11.1÷[19.2×5.2-5.2×14.6+5.4×3.7-4.6×1.5].-数学

题文

(1)3.875×(10.3-0.775)÷
31
8
×
8
31

(2)5.42-11.1÷[19.2×5.2-5.2×14.6+5.4×3.7-4.6×1.5].
题型:解答题  难度:中档

答案

(1)3.875×(10.3-0.775)÷
31
8
×
8
31

=
31
8
×(
103
10
-
31
40
)÷
31
8
×
8
31

=
31
8
×
381
40
×
8
31
×
8
31

=(
31
8
×
8
31
)×(
381
40
×
8
31
),
=1×
381
155

=
381
155


(2)5.42-11.1÷[19.2×5.2-5.2×14.6+5.4×3.7-4.6×1.5],
=5.42-11.1÷[(19.2-14.6)×5.2-+5.4×3.7-4.6×1.5],
=5.42-11.1÷[4.6×5.2+5.4×3.7-4.6×1.5],
=5.42-11.1÷[4.6×(5.2-1.5)+5.4×3.7],
=5.42-11.1÷[4.6×3.7+5.4×3.7],
=5.42-11.1÷[(4.6+5.4)×3.7],
=5.42-11.1÷(10×3.7),
=5.42-11.1÷37,
=5.42-0.3,
=5.12.

据专家权威分析,试题“(1)3.875×(10.3-0.775)÷318×831(2)5.42-11.1÷[19.2×5.2-5..”主要考查你对  整数,小数,分数,百分数和比例的混合计算  等考点的理解。关于这些考点的“档案”如下:

整数,小数,分数,百分数和比例的混合计算

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