问题
计算题
计算:3(x﹣y)﹣2(x+y)﹣5(x﹣y)+4(x+y)+3(x﹣y).
答案
解:3(x﹣y)﹣2(x+y)﹣5(x﹣y)+4(x+y)+3(x﹣y)
= 3(x﹣y)﹣5(x﹣y)+3(x﹣y)﹣2(x+y)+4(x+y)
= x﹣y+2(x+y)
= x﹣y+2x+2y
=3x+y.
计算:3(x﹣y)﹣2(x+y)﹣5(x﹣y)+4(x+y)+3(x﹣y).
解:3(x﹣y)﹣2(x+y)﹣5(x﹣y)+4(x+y)+3(x﹣y)
= 3(x﹣y)﹣5(x﹣y)+3(x﹣y)﹣2(x+y)+4(x+y)
= x﹣y+2(x+y)
= x﹣y+2x+2y
=3x+y.