x+y分之x-y=-2,求3(x+y)分之x-y减去x-y分之2(x+y)的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/25 11:38:43
x+y分之x-y=-2,求3(x+y)分之x-y减去x-y分之2(x+y)的值
xQMN@JêX'UۻLh "`b"1i@2Lˊ+fZr}?ö*C+1vª=h}zӤws^Ox/>ض%O}82|̇)( 6w \@"Xiڼ4+b 3E.T{m]Y3S'L?BY̮>mW'\ۭn67i2b^ΏDGMF2\]wj+YAB?`.`z>wy ``vFŌtja~7T5

x+y分之x-y=-2,求3(x+y)分之x-y减去x-y分之2(x+y)的值
x+y分之x-y=-2,求3(x+y)分之x-y减去x-y分之2(x+y)的值

x+y分之x-y=-2,求3(x+y)分之x-y减去x-y分之2(x+y)的值
因为(x-y)/(x+y)=-2
所以(x+y)/(x-y)=-1/2
所以(x-y)/3(x-y)-2(x+y)/(x-y)
=1/3*(-2)-2*(-1/2)
=-2/3+1
=1/3

(x-y)/(x+y)= -2
(x+y)/(x-y)= -1/2
3(x+y)分之(x-y)减去(x-y)分之2(x+y)
= -2/3-2(-1/2)
= -2/3+1
=1/3

整体思想,"x+y分之x-y"看作一个数。
所求的式子=3*(-2)-2*(1/(-2))=-6+1=-5
不知道我理解你的汉语表达式有没有错,反正你用整体思想就对了