已知2x-y除以x+3y等于3;求代数式4x-2y除以x+3y减4x+12y除以2x-y
问题描述:
已知2x-y除以x+3y等于3;求代数式4x-2y除以x+3y减4x+12y除以2x-y
答
(2x-y)/(x+3y)=3
∴(x+3y)/(2x-y)=1/3
(4x-2y)/(x+3y)-(4x+12y)/(2x-y)
=2*(2x-y)/(x+3y)-4*(x+3y)/(2x-y)
=6-4/3
=14/3
答
由(2x-y)/(x+3y)=3
(4x-2y)/(x+3y)-(4x+12y)/(2x-y)
=2(2x-y)/(x+3y)-4(x+3y)/(2x-y)
=2×3-4×1/3
=14/3