考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算,整數(shù)、分?jǐn)?shù)、小數(shù)、百分?jǐn)?shù)四則混合運(yùn)算
專(zhuān)題:運(yùn)算順序及法則,運(yùn)算定律及簡(jiǎn)算
分析:(1)先算除法和乘法,再算減法;
(2)先算減法,再算除法,最后算加法;
(3)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(4)先算乘法和除法,再算加法;
(5)根據(jù)加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(6)先算加法,再算乘法,最后算除法.
解答:
解:(1)360÷15-2.5×1.4
=24-3.5
=20.5;
(2)0.16+4÷(
-
)
=0.16+4÷
=0.16+16
=16.16;
(3)43×99+43
=43×(99+1)
=43×100
=4300;
(4)
×
+
÷
=
+
=
;
(5)
-
+
-
=(
+
)-(
+
)
=1-1
=0;
(6)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
.
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.