分析:(1)23×0.75+27×
+50×75%,把分?jǐn)?shù)、百分?jǐn)?shù)化成小數(shù),再運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算.
(2)2-2÷3,按照運(yùn)算順序直接進(jìn)行簡(jiǎn)算;
(3)
÷(
+
),根據(jù)分?jǐn)?shù)四則混合運(yùn)算的順序,按照分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算;
(4)6
-(2
-),根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;
(5)1.25×0.25×32,把32 分解為8×4,再運(yùn)用乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(6)8.5
-÷,根據(jù)混合運(yùn)算的運(yùn)算順序,按照法則進(jìn)行計(jì)算;
(7)2011×
,轉(zhuǎn)化為:(2010+1)×
,再運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(8)12.7×99+12.7,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(9)
×〔
-(
-
)〕,根據(jù)分?jǐn)?shù)四則混合運(yùn)算的順序,按照分?jǐn)?shù)四則運(yùn)算的計(jì)算法則進(jìn)行計(jì)算;
(10)87×101,運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算;
(11)1200-197,根據(jù)減法的運(yùn)算性質(zhì)進(jìn)行簡(jiǎn)算;