x+2y=3,-5+3x+6y的值为_____
问题描述:
x+2y=3,-5+3x+6y的值为_____
答
-5+3x+6y
=-5+3(x+2y)
=-5+3*3
=4
x+2y=3,-5+3x+6y的值为_____
-5+3x+6y
=-5+3(x+2y)
=-5+3*3
=4