分析:(1)根據(jù)乘法分配律進(jìn)行計(jì)算;
(2)先算乘法,再算加法;
(3)根據(jù)乘法分配律進(jìn)行計(jì)算;
(4)根據(jù)加法交換律和結(jié)合律,以及連減的性質(zhì)進(jìn)行計(jì)算;
(5)根據(jù)乘法分配律進(jìn)行計(jì)算;
(6)根據(jù)加法交換律和結(jié)合律,以及連減的性質(zhì)進(jìn)行計(jì)算.
解答:解:
(1)(
+
+
)÷
,
=(
+
+
)×48,
=
×48+
×48+
×48,
=40+28+18,
=68+18,
=86;
(2)9×3.6+2.9×6.4,
=32.4+18.56,
=50.96;
(3)(
+
-
)×36,
=
×36+
×36-
×36,
=8+30-35,
=38-35,
=3;
(4)7.25-3
+3.75-6
,
=(7.25+3.75)-(3
+6
),
=11-10,
=1;
(5)0.75×99+0.75,
=0.75×(99+1),
=0.75×100,
=75;
(6)3.6-2.8+7.4-6.2,
=(3.6+7.4)-(2.8+6.2),
=11-9,
=2.
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)算律簡(jiǎn)便計(jì)算.