考點(diǎn):整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算,運(yùn)算定律與簡(jiǎn)便運(yùn)算,小數(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)根據(jù)加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(2)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(3)先算減法,再算乘法,最后算加法;
(4)先算減法,再算乘法,最后算除法.
解答:
解:(1)
+
+0.75+0.6
=(
+0.75)+(
+0.6)
=1+1
=2;
(2)6.02×101-6.02
=6.02×(101-1)
=6.02×100
=602;
(3)2.4+3.2×(4.6-3.1)
=2.4+3.2×1.5
=2.4+4.8
=7.2;
(4)
÷[(
-
)×
]
=
÷[
×
]
=
÷
=30.
點(diǎn)評(píng):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.