题目内容
(2010?安岳县)计算.
349×101-349 | 306×35-4080÷24 | 7.09-2.88-3.12 | (0.25+11.5÷4.6)×3.45. |
分析:(1)运用乘法的分配律进行简算,
(2)先同时计算乘法算式和除法算式,再算减法,
(3)运用减法的性质进行简算即可,
(4)先算小括号里的乘法,再算小括号里的加法,最后算括号外的乘法.
(2)先同时计算乘法算式和除法算式,再算减法,
(3)运用减法的性质进行简算即可,
(4)先算小括号里的乘法,再算小括号里的加法,最后算括号外的乘法.
解答:解:(1)349×101-349,
=349×(101-1),
=349×100,
=34900;
(2)306×35-4080÷24,
=10710-170,
=10540;
(3)7.09-2.88-3.12,
=7.09-(2.88+3.12),
=7.09-6,
=1.09;
(4)(0.25+11.5÷4.6)×3.45,
=(0.25+2.5)×3.45,
=2.75×3.45,
=9.4875.
=349×(101-1),
=349×100,
=34900;
(2)306×35-4080÷24,
=10710-170,
=10540;
(3)7.09-2.88-3.12,
=7.09-(2.88+3.12),
=7.09-6,
=1.09;
(4)(0.25+11.5÷4.6)×3.45,
=(0.25+2.5)×3.45,
=2.75×3.45,
=9.4875.
点评:查看了整数、小数四则混合运算的顺序,能简算的要运用运算定律进行简算.
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