分析:(1)根據(jù)乘法分配律進(jìn)行計(jì)算;
(2)根據(jù)乘法分配律進(jìn)行計(jì)算;
(3)根據(jù)減法的性質(zhì)進(jìn)行計(jì)算;
(4)根據(jù)除法的性質(zhì)進(jìn)行計(jì)算;
(5)根據(jù)加法交換律和結(jié)合律以及減法的性質(zhì)進(jìn)行計(jì)算;
(6)根據(jù)加法交換律和結(jié)合律進(jìn)行計(jì)算.
解答:解:
(1)56×(
+
)-22,
=56×
+56×
-22,
=16+35-22,
=51-22,
=29;
(2)40%×38+12×
,
=0.4×38+12×0.4,
=0.4×(38+12),
=0.4×50,
=20;
(3)2-
-
,
=2-(
+
),
=2-1,
=1;
(4)23000÷(125×23),
=23000÷125÷23,
=23000÷23÷125,
=1000÷125,
=8;
(5)4.55-1.8-1.2+5.45,
=(4.55+5.45)-(1.8+1.2),
=10-3,
=7;
(6)198+736+802+164,
=(198+802)+(736+164),
=1000+900,
=1900.
點(diǎn)評(píng):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)算律簡便計(jì)算.