题目内容

用你喜欢的方法计算下列各题(最后四题用简便方法计算).
1575-635+265 9800÷(49×25) 240÷80+71×12 (57×35+43×35)÷14 150+42×37
480-(32+32÷4) 125×56 35×99+35 790-218-82 10200÷4÷25.
分析:(1)(2)(3)(4)(5)(6)依据四则运算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答,
(7)化56=8×7,再运用乘法结合律即可解答,
(8)运用乘法分配律解答,
(9)运用减法性质解答,
(10)运用除法性质解答.
解答:解:(1)1575-635+265,
=940+265,
=1205;

(2)9800÷(49×25),
=9800÷1225,
=8;

(3)240÷80+71×12,
=3+852,
=855;

(4)(57×35+43×35)÷14,
=(1995+1505)÷14,
=3500÷14,
=250;

(5)150+42×37,
=150+1554,
=1704;

(6)480-(32+32÷4),
=480-(32+8),
=480-40,
=440;

(7)125×56,
=125×8×7,
=1000×7,
=7000;

(8)35×99+35,
=(99+1)×35,
=100×35,
=3500;

(9)790-218-82,
=790-(218+82),
=790-300,
=490;

(10)10200÷4÷25,
=10200÷(4×25),
=10200÷100,
=102.
点评:本题考查知识点:(1)依据四则运算顺序正确进行计算,(2)正确运用简便算法解决问题.
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