考點(diǎn):運(yùn)算定律與簡(jiǎn)便運(yùn)算,小數(shù)四則混合運(yùn)算,整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)先除以0.8,再乘上0.8,再根據(jù)除法的性質(zhì)進(jìn)行簡(jiǎn)算;
(2)先把除法轉(zhuǎn)化為乘法,并把括號(hào)里的進(jìn)行化簡(jiǎn),再利用乘法分配律簡(jiǎn)算;
(3)利用減法的性質(zhì)簡(jiǎn)算;
(4)先把除法轉(zhuǎn)化為乘法,分?jǐn)?shù)化為小數(shù),再利用乘法分配律以及減法的性質(zhì)簡(jiǎn)算;
(5)利用乘法分配律簡(jiǎn)算.
解答:
解:(1)1.02÷1.25
=1.02÷1.25÷0.8×0.8
=1.02÷(1.25×0.8)×0.8
=1.02÷1×0.8
=1.02×0.8
=0.816;
(2)4.6×
+4.4÷1
+(1-0.1)
=4.6×
+4.4×
+
=(4.6+4.4+1)×
=10×
=9;
(3)5.87-(3.87-0.96)
=5.87-3.87+0.96
=2+0.96
=2.96;
(4)101÷
-11
=101×10.1-11.1
=101×10.1-10.1-1
=(101-1)×10.1-1
=100×10.1-1
=1010-1
=1009;
(5)(
+
)×29×23
=
×29×23+
×29×23
=2×23+3×29
=46+87
=133.
點(diǎn)評(píng):本題考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律簡(jiǎn)便計(jì)算.