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)算定律與簡便運(yùn)算
專題:運(yùn)算順序及法則,運(yùn)算定律及簡算
分析:(1)先算減法,再算除法,最后算乘法;
(2)先算乘法,再算減法,最后算除法;
(3)根據(jù)加法交換律和結(jié)合律進(jìn)行簡算;
(4)根據(jù)乘法分配律進(jìn)行簡算;
(5)先算加法,再算乘法,最后算除法;
(6)根據(jù)乘法分配律進(jìn)行簡算.
解答:
解:(1)36÷(
-
)×3
=36÷
×3
=72×3
=216;
(2)(
-
×
)÷
=(
-
)÷
=
÷
=
;
(3)
+(
-
)-
=(
+
)-(
+
)
=1-1
=0;
(4)36×(
+
-
)
=36×
+36×
-36×
=9+15-6
=24-6
=18;
(5)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=3;
(6)25×
+
×75
=(25+75)×
=100×
=40.
點(diǎn)評:考查了運(yùn)算定律與簡便運(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)算定律簡便計算.