(3-112.5%+1
1
7
)×1
8
13
÷
31
36
分析:本組題目主要運(yùn)用百分?jǐn)?shù),分?jǐn)?shù)的互化進(jìn)行計(jì)算,運(yùn)用分?jǐn)?shù)乘除法的計(jì)算法則,先算小括號(hào)內(nèi)的,再算括號(hào)外面的.即可求值.
解答:解:(3-112.5%+1
1
7
)×1
8
13
÷
31
36
,
=(
15
8
+
8
7
)×
21
13
×
36
31
,
=(
105
56
+
64
56
)×
21
13
×
36
31

=
169
56
×
21
13
×
36
31
,
=
39
8
×
36
31
,
=
351
62
點(diǎn)評(píng):本題主要考查了百分?jǐn)?shù),分?jǐn)?shù)的互化及分?jǐn)?shù)乘除法計(jì)算法則的運(yùn)用.
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