问一道数学题..化简求值化简求值...其中x=9分之1 y=-3
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 01:36:20
![问一道数学题..化简求值化简求值...其中x=9分之1 y=-3](/uploads/image/z/1789137-9-7.jpg?t=%E9%97%AE%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98..%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC...%E5%85%B6%E4%B8%ADx%3D9%E5%88%86%E4%B9%8B1+y%3D-3)
xQn@(R%WzwmٽG^6A8nV $H8(k;VT`ͼ7oŲg/zoћ_*jf Q+g ?:OeYɳAyl:-YY^d餴"V<9"/\ y{mﱻm2?<(MP#G}MeR*u8*Tx6p LgRDZ@B#q$M: /Uƾ%"u-]!qYsb??Ө!Cxچd 2kJw$7Mj_<-囀ZYXaͼ)sSvHo2"Yш+ǍNފ KEz0G(ءc, e!Z^-O)f7-ZkmDk5SωԋE~wrv7o[L
问一道数学题..化简求值化简求值...其中x=9分之1 y=-3
问一道数学题..化简求值
化简求值...其中x=9分之1 y=-3
问一道数学题..化简求值化简求值...其中x=9分之1 y=-3
(x+y^2)+[2x+y^2/(1*2)]+[3x+y^2/(2*3)]+
+[3x+y^2/(3*4)]+...+[9x+y^2/(8*9)]
=x+2x+3x+...+9x+y^2[1+1/(1*2)+1/(2*3)+...+1/(8*9)]
=(1+9)*9x/2+y^2(1+1-1/2+1/2-1/3+.+1/8-1/9)
=45x+(1+1-1/9)y^2
=45x+17y^2/9
=45*1/9+17/9*(-3)^2
=5+17/9*9
=5+17
=22
=(1+2+3+....9)x+(1+(1-1/2)+(1/2-1/3)....(1/8-1/9))Y平方
=45X+17/9*y平方
=17+5=22