分析:(1)、(7)、(8)、(9)、(10)、(11)、(17)、(20)、(21)、(22)、(23)、(24)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(2)、(12)、(14)、(25)、(27)、(28)根據(jù)加法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(3)、(4)、(5)、(6)、(13)、(15)、(16)、(19)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(18)根據(jù)連除的性質(zhì)進(jìn)行簡(jiǎn)算;
(26)、(29)根據(jù)連減的性質(zhì)進(jìn)行減法.
解答:解:
(1)76×101-76,
=76×(100-1),
=76×100,
=7600;
(2)58+39+42+61,
=(58+42)+(39+61),
=100+100,
=200;
(3)4×39×2.5,
=39×(4×2.5),
=39×10,
=390;
(4)(25×15)×4,
=(25×4)×15,
=100×15,
=1500;
(5)25×42×4,
=(25×4)×42,
=100×42,
=4200;
(6)125×32,
=125×(4×8),
=(125×8)×4,
=1000×4,
=4000;
(7)3.6×97+3.6×3,
=3.6×(97+3),
=3.6×100,
=360;
(8)4×25+16×25,
=(4+16)×25,
=20×25,
=500;
(9)36×45+36×56-36,
=36×(45+56-1),
=36×100,
=3600;
(10)68×102,
=68×(100+2),
=68×100+68×2,
=6800+136,
=6935;
(11)64×15-14×15,
=(64-14)×15,
=50×15,
=750;
(12)167+289+33,
=(167+33)+289,
=200+289,
=489;
(13)25×64×125,
=25×(8×8)×125,
=(25×8)×(8×125),
=200×1000,
=200000;
(14)378+525+75,
=378+(525+75),
=378+600,
=978;
(15)0.4×25×1.6×25,
=0.4×25×(4×0.4)×25,
=(0.4×25)×(4×25)×0.4,
=10×100×0.4,
=1000×0.4,
=400;
(16)5×289×2,
=289×(5×2),
=289×10,
=2890;
(17)79×2.5+2.5,
=(79+1)×2.5,
=80×2.5,
=200;
(18)4.08÷1.25÷0.8,
=4.08÷(1.25×0.8),
=4.08÷1,
=4.08;
(19)125×88,
=125×(8×11),
=(125×8)×11,
=1000×11,
=11000;
(20)87×9.9,
=87×(10-0.1),
=87×10-87×0.1,
=870-8.7,
=861.3;
(21)101×0.82-0.82,
=(100-1)×0.82,
=100×0.82,
=82;
(22)25×97+25×3,
=25×(97+3),
=25×100,
=2500;
(23)(125+17)×8,
=125×8+17×8,
=1000+136,
=1136;
(24)66×93+93×33+93,
=(66+33+1)×93,
=100×93,
=9300;
(25)
+
+
,
=(
+
)+
,
=1+
,
=1
;
(26)1-
-
,
=1-(
+
),
=1-
,
=
;
(27)
+
+
,
=(
+
)+
,
=1+
,
=1
;
(28)
+
-
,
=(
-
)+
,
=
+
,
=
;
(29)1-
-
,
=1-(
+
),
=1-
,
=
.
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.