已知la-2l+lb+4l,求2a加3b
4个回答
la-2l+lb+4l=0
所以
a-2=0
b+4=0
a=2
b=-4
2a+3b=2x2+4x(-4)
=4-16
=-12
相关问题
已知la-2l+lb-3l+lc-4l=0,求a+2b+3c的值
已知la-3l+lb-5l=0,求5a-2b的值?
la-1/2l+lb-1/3l+lc-1/4l=0,求a+b+c的值.
如果la-2l+lb-3l=0,则2a+b分之a+b=
已知实数a,b,c满足la-1l+lb+3l+l3c-1l=0,求(axbxc)^2007的值
已知la+1l+lb+2I+丨C+3I=0求(a-1)(b+2)(C-3)的值
有理数a、b满足la+4l+lb-1l=0,求a+b的值
若la-3l+lb-7l=0,求a+b+2000的值
la-1l+lb+3l=0求b-a-0.5的值