(趣味題)用簡便方法計算.
(1)67×12+67×35+67×53
(2)374+101
(3)125+56
(4)128-72+28
(5)3000÷25÷4.
解:(1)67×12+67×35+67×53,
=67×(12+35+53),
=67×100,
=6700;
(2)374+101,
=374+100+1,
=475;
(3)125+56,
=125+55+1,
=181;
(4)128-72+28,
=100-72+28+28,
=28+28+28,
=28×3,
=84;
(5)3000÷25÷4,
=3000÷(25×4),
=3000÷100,
=30.
分析:(1)67×12+67×35+67×53,運用乘法分配律進(jìn)行簡算;
(2)374+101,根據(jù)加法的運算性質(zhì)進(jìn)行簡算;
(3)125+56,根據(jù)加法的運算性質(zhì)進(jìn)行簡算;
(4)128-72+28,根據(jù)加、減法的運算性質(zhì)進(jìn)行簡算;
(5)3000÷25÷4.根據(jù)除法的運算性質(zhì)進(jìn)行簡算.
點評:此題考查的目的是使學(xué)生靈活運用運算定律、運算性質(zhì),進(jìn)行簡便計算.