425-83-1774×38+74×6232×125
99×35526-(134+226)7.25+49.6+52.75

解:(1)425-83-17,
=425-(83+17),
=425-100,
=325;

(2)74×38+74×62,
=74×(38+62),
=74×100,
=7400;

(3)32×125,
=4×8×125,
=4×(8×125),
=4×1000,
=4000;

(4)99×35,
=(100-1)×35,
=100×35-35×1,
=3500-35,
=3465;

(5)526-(134+226),
=526-226-134,
=300-134,
=166;

(6)7.25+49.6+52.75,
=7.25+52.75+49.6,
=60+49.6,
=109.6.
分析:(1)(5)根據(jù)減法的性質(zhì)簡算;
(2)運用乘法分配律簡算;
(3)先把32分成4×8,再運用乘法結(jié)合律簡算;
(4)先把99分解成100-1,再運用乘法分配律簡算;
(6)根據(jù)加法交換律簡算.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.
練習(xí)冊系列答案
相關(guān)習(xí)題

同步練習(xí)冊答案