考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,整數(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)乘法分配律進(jìn)行簡(jiǎn)算;
(2)根據(jù)加法交換律和結(jié)合律以及減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)根據(jù)乘法的性質(zhì)進(jìn)行簡(jiǎn)算;
(4)根據(jù)加法結(jié)合律以及減法的性質(zhì)進(jìn)行簡(jiǎn)算.
解答:
解:(1)0.95×
+
×0.95
=0.95×(
+
)
=0.95×1
=0.95;
(2)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(3)10000÷25÷8÷4
=10000÷8÷25÷4
=(10000÷8)÷(25×4)
=1250÷100
=12.5;
(4)
+
+3-1.625-2.375
=(
+
)+3-(1.625+2.375)
=1
+3-4
=4
-4
=
.
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.