分析:(1)根據(jù)連減的性質(zhì)進(jìn)行簡(jiǎn)算;
(2)根據(jù)除法的性質(zhì)進(jìn)行簡(jiǎn)算;
(3)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)先算除法,再算減法,最后算乘法;
(6)先算減法,再算加法,最后算除法.
解答:解:
(1)2182-1655-345
=2182-(1655+345)
=2812-2000
=812;
(2)3200÷4÷25
=3200÷(4×25)
=3200÷100
=32;
(3)298×99+298
=298×(99+1)
=298×100
=29800;
(4)(40+8)×25
=40×25+8×25
=1000+200
=1200;
(5)(500-275÷5)×4
=(500-55)×4
=445×4
=1780;
(6)(970-90+20)÷20
=(880+20)÷20
=900÷20
=45.
點(diǎn)評(píng):此題主要考查整數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.