Question

（1+0.12+0.23）*（0.12+0.23+0.34）-（1+0.12+0.23+0.34）*（0.12+0.23）

简便计算啊！感谢了，要最简分数！不用“设”

Answer 1

（1+0.12+0.23）×（0.12+0.23+0.34）－（1+0.12+0.23+0.34）×（0.12+0.23）
=（1+0.35）×0.69 －（1+0.69）×0.35
=0.69+ 0.35×0.69 －0.35-0.69×0.35
=0.69-0.35
=0.34
=17/50

Answer 2

原式=（1+0.12+0.23）*（0.12+0.23）+（0.12+0.23）*0.34+0.34-（1+0.12+0.23）*（0.12+0.23）-（0.12+0.23)*0.34=0.34

Answer 3

(1+0.21+0.23)×（0.12+0.23+0.34）-（1+0.12+0.23+0.34）×（0.12+0.23）

=（1-1)+（0.12-0.12）+（0.23-0.
23）+0.34×（0.12-0.12）+（0.2
3-0.23）+0.34

=0+0+0+0.34×0+0+0+0.34

=0+0+0+0+0+0+0.34

=0.34

Answer 4

1+0.12+0.23）*（0.12+0.23+0.34)=(0.12+0.23)*(0.12+0.23+0.34)+（0.12+0.23+0.34）*1
（1+0.12+0.23+0.34*（0.12+0.23)=(0.12+0.23+0.34)*(0.12+0.23)+
（0.12+0.23）*1
代入结果
=
(0.12+0.23)
*
(0.12+0.23+0.34)
+
0.12+0.23+0.34
-
(0.12+0.23+0.34)
*
(0.12+0.23)
+
0.12+0.23
=
0.34

Answer 5

(1+0.12+0.23)x(0.12+0.23+0.34)-(1+0.12+0.23+0.34)x(0.12+0.23)
=(1+0.12+0.23)x(0.12+0.23+0.34)-(0.12+0.23+0.34)x(0.12+0.23)
-1x
(0.12+0.23)=[1+0.12+0.23-(0.12+0.23)]x(0.12+0.23+0.34)-(0.12+0.23)=0.12+0.23+0.34-0.12-0.23=0.34