3.14×8= 0.8×40%= 0.125×32=
7
8
-
5
6
=
4.5×102= 0.52-0.32= 10×10%=
1
7
÷7×
1
7
=
3.14×0.9+3.14×0.1= 52×20%= 30÷75%= 6÷(
1
2
-
1
3
)=
分析:本題根據(jù)小數(shù)、分?jǐn)?shù)的加法、減法、乘法與除法的運(yùn)算法則及四則混合運(yùn)算的運(yùn)算順計(jì)算即可;
0.125×32可將32拆分為8×4計(jì)算;
4.5×102可將102拆分為100+2后根據(jù)乘法分配律計(jì)算;
1
7
÷7×
1
7
可根據(jù)乘法交換律計(jì)算;
3.14×0.9+3.14×0.1可根據(jù)乘法分配律計(jì)算.
解答:解:
3.14×8=25.12, 0.8×40%=0.32, 0.125×32=4,
7
8
-
5
6
=
1
24
,
4.5×102=459, 0.52-0.32=0.16, 10×10%=1,
1
7
÷7×
1
7
=
1
49
,
3.14×0.9+3.14×0.1=3.14, 52×20%=10.4, 30÷75%=40, 6÷(
1
2
-
1
3
)=36.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù)的特點(diǎn)及內(nèi)在聯(lián)系,然后運(yùn)用合適的方法計(jì)算.
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