根據(jù)題的特點(diǎn)靈活選擇方法計(jì)算:
4
5
+55%
26.5×20%+
1
5
×13.5
11.8-( 
5
2
+30%)
25×12.5×80%
35×10%+18.5÷50%
2
3
×24-3.2÷25%
分析:(1)先化為小數(shù),再計(jì)算即可;
(2)根據(jù)乘法分配律簡(jiǎn)便計(jì)算;
(3)先化為小數(shù),再計(jì)算即可;
(4)根據(jù)乘法結(jié)合律簡(jiǎn)便計(jì)算;
(5)先算乘除,再算加法;
(6)先算乘除,再算減法.
解答:解:(1)
4
5
+55%=0.8+0.55=1.35;

(2)26.5×20%+
1
5
×13.5,
=(26.5+13.5)×0.2,
=40×0.2,
=8;

(3)11.8-( 
5
2
+30%),
=11.8-2.8,
=9;

(4)25×12.5×80%,
=25×(12.5×80%),
=25×10,
=250;

(5)35×10%+18.5÷50%,
=3.5+37,
=40.5;

(6)
2
3
×24-3.2÷25%,
=16-12.8,
=3.2.
點(diǎn)評(píng):考查了百分?jǐn)?shù)的加減乘除運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算,關(guān)鍵是將分?jǐn)?shù),小數(shù),百分?jǐn)?shù)統(tǒng)一為一種形式.
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