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450÷18+375 3.68-0.82-0.18 36×(+)×24-6× -(+) 8.24-8.24÷419÷[(+)÷]×÷+ ×71+19÷
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解:(1)450÷18+375,
=25+375,
=400;
(2)3.68-0.82-0.18,
=3.68-(0.82+0.18),
=3.68-1,
=2.68;
(3)36×(+),
=36×+36×,
=8+21,
=29;
(4)×24-6×,
=×(24-6),
=×18,
=16;
(5)-(+),
=--,
=--,
=1-,
=;
(6)8.24-8.24÷4,
=8.24-2.06,
=6.18;
(7)19÷[(+)÷],
=19÷[÷],
=19÷,
=10;
(8)×÷+,
=××+,
=×+,
=+,
=;
(9)×71+19÷,
=×71+19×,
=×(71+19),
=×90,
=63.
解析分析:(1)先算除法,再算加法;
(2)(5)根据减法的性质简算;
(3)(4)运用乘法分配律简算;
(6)先算除法,再算减法;
(7)先算小括号里面的加法,再算中括号里面的除法,最后算括号外的除法;
(8)先把除法变成乘法,再运用乘法交换律简算,最后算加法;
(9)先把除法变成乘法,再运用乘法分配律简算.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.