1/3y-2/3y+2y
-5a+0.3a-2.7a
X+7X-5X
希望有详细步骤= =~谢谢!
1/3y-2/3y+2y
-5a+0.3a-2.7a
X+7X-5X
希望有详细步骤= =~谢谢!
1/3y-2/3y+2y=-1/3y+6/3y=5/3y
-5a+0.3a-2.7a=-4.7a-2.7a=-7.4a
X+7X-5X=8X-5X=3X
1/3y-2/3y+2y=(-1/3)y+2y=(-5/3)y
-5a+0.3a-2.7a=-7.7a+0.3a=-7.4a
X+7X-5X=8x-5x=3x