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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