考點(diǎn):小數(shù)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,分?jǐn)?shù)的四則混合運(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)減法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)先算除法,再算減法,最后算乘法;
(4)根據(jù)乘法交換律進(jìn)行簡(jiǎn)算;
(5)先算除法,再算加法.
解答:
解:(1)0.67×99+0.67
=0.67×(99+1)
=0.67×100
=67;
(2)23-
-
=23-(
+
)
=23-1
=22;
(3)(3618÷18-145)×20
=(201-145)×20
=56×20
=1120;
(4)4×0.73×25
=4×25×0.73
=100×0.73
=73;
(5)
+
÷
=
+
=
.
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.