考點:運算定律與簡便運算
專題:運算定律及簡算
分析:(1)(2)(3)(4)根據連減的簡便方法計算即可;
(5)先變形為627-100+2再計算;
(6)先變形為500+86-2再計算;
(7)先變形為657+100-1再計算;
(8)根據加法交換律簡便計算.
解答:
解:(1)234-34-66
=234-(34+66)
=234-100
=134;
(2)528-53-47
=528-(53+47)
=528-100
=428;
(3)435-(135+189)
=435-135-189
=300-189
=111;
(4)248-75-25
=248-(75+25)
=248-100
=148;
(5)627-98
=627-100+2
=527+2
=529;
(6)498+86
=500+86-2
=586-2
=584
;
(7)657+99
=657+100-1
=657-1
=656;
(8)127+44+73
=127+73+44
=200+44
=244.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學的運算定律簡便計算.