計(jì)算下面各題,能簡算的要簡算
44×25 10-0.57+1.25 4.02-2.7+1.98
3.9+2.61+6.1 2010×9+2010 257-65+43+165
800-400÷25×4 (800-400)÷25×4 800-400÷(25×4)
分析:(1)根據(jù)乘法結(jié)合律進(jìn)行計(jì)算;
(2)按照從左向右的順序進(jìn)行計(jì)算;
(3)按照從左向右的順序進(jìn)行計(jì)算;
(4)根據(jù)加法交換律進(jìn)行計(jì)算;
(5)根據(jù)乘法分配律進(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;
(7)先算除法,再算乘法,最后算減法;
(8)先算減法,再算除法,最后算乘法;
(9)先算乘法,再算除法,最后算減法.
解答:解:
(1)44×25,
=(11×4)×25,
=11×(4×25),
=11×100,
=1100;

(2)10-0.57+1.25,
=9.43+1.25,
=10.68;

(3)4.02-2.7+1.98,
=1.32+1.98,
=3.3;

(4)3.9+2.61+6.1,
=3.9+6.1+2.61,
=10+2.61,
=12.61;

(5)2010×9+2010,
=2010×(9+1),
=2010×10,
=20100;

(6)257-65+43+165,
=(257+43)+(165-65),
=300+100,
=400;

(7)800-400÷25×4,
=800-16×4,
=800-64,
=736;

(8)(800-400)÷25×4,
=400÷25×4,
=16×4,
=64;

(9)800-400÷(25×4),
=800-400÷100,
=800-4,
=796.
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)算律簡便計(jì)算.
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