相关x1y的文学知识

若xy=,x-y=-1,则(x+1)(y-1)=

若xy=,x-y=-1,则(x+1)(y-1)=

问题详情:若xy=,x-y=-1,则(x+1)(y-1)=____ __.【回答】0          知识点:二次根式的乘除题型:填空题...

当x=1,y=时,3x(2x+y)-2x(x-y)=   .

当x=1,y=时,3x(2x+y)-2x(x-y)=   .

问题详情:当x=1,y=时,3x(2x+y)-2x(x-y)=.【回答】5.【解析】3x(2x+y)-2x(x-y)=6x2+3xy-2x2+2xy=4x2+5xy,当x=1,y=时,原式=4x2+5xy=4×12+5×1×=4+1=5.*:5知识点:整式的乘法题型:填空题...