题目内容
【题目】
用你喜欢的方法算:
×22 4.6÷4+7.4×
95.6×1.8+95.6×8.2 3.9+4+6.1+5
0.15÷0.25+(+) (++)×0.24
3.5×2.7﹣52.2÷18 18 ﹣5.26﹣4.74
(2 +1)÷(6﹣5) (25+)×4
+1++2 .
【答案】(1)×22,
=;
(2)4.6÷4+7.4×,
=4.6×+7.4×,
=(4.6+7.4)×,
=12×,
=3;
(3)95.6×1.8+95.6×8.2,
=95.6×(1.8+8.2),
=95.6×10,
=956;
(4)3.9+4+6.1+5,
=(3.9+6.1)+(4+5),
=10+10,
=20;
(5)0.15÷0.25+(+)
=+,
=;
(6)(++)×0.24
=×0.24+×0.24+×0.24,
=0.12+0.08+0.06,
=0.26;
(7)3.5×2.7﹣52.2÷18,
=9.45﹣2.9,
=6.55;
(8)18 ﹣5.26﹣4.74,
=18﹣(5.26+4.74),
=18﹣10,
=8;
(9)(2 +1)÷(6﹣5),
=÷,
=4;
(10)(25+)×4
=25×4+×4,
=100+1,
=101;
(11)+1++2
=(+)+(1+2),
=1+4,
=5;
(12)
=9+××,
=9+,
=+,
=.
【解析】
试题分析:算式(1)(5)(7)(9)(12)可根据四则混合运算的运算顺序计算:先算乘除,再算加减,有括号的要先算括号里面的.
算式(2)(3)(6)(10)可根据乘法分配律计算;
算式(4)(11)可根据加法交换律及结合律计算;
算式(8)可根据一个数减两个数,等于用这个数减去这两个数的和的减法性质进行计算.
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