题目内容

脱式计算
(1)135+980÷7(2)(430-216)×7(3)45×8÷4(4)728-276÷3
(5)35+15×11(5B)25×4+372(6)12×24+46(6B)305÷(213-208)
(7)52×(36÷3)(7b)98×4-276(8)42×11-368(8b)(60+70)×3.

(1)135+980÷7,
=135+140,
=275;

(2)(430-216)×7,
=214×7,
=1498;

(3)45×8÷4,
=360÷4,
=90;

(4)728-276÷3,
=728-92,
=636;

(5)35+15×11,
=35+165,
=200;

(5b)25×4+372,
=100+372,
=472;

(6)12×24+46,
=288+46,
=334;

(6b)305÷(213-208),
=305÷5,
=61;

(7)52×(36÷3),
=52×12,
=624;

(7b)98×4-276,
=392-276,
=116;

(8)42×11-368,
=462-368,
=94;

(8b)(60+70)×3,
=130×3,
=390.
分析:(1)先算除法,再算加法;
(2)先算小括号里的减法,再算乘法;
(3)从左向右进行计算即可;
(4)先算除法,再算减法;
(5)先算乘法,再算加法;
(5B)先算乘法,再算加法;
(6)先算乘法,再算加法;
(6B)先算小括号里的减法,再算括号外的除法;
(7)先算小括号里的除法,再算括号外的乘法;
(7b)先算乘法,再算减法;
(8)先算乘法,再算减法;
(8b)先算小括号里的加法,再算括号外的乘法.
点评:考查了整数四则混合运算的顺序,注意有括号的运算.
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