问题
解答题
计算:x+{3x-[(x+2y)-(2x-y)]}+5.
答案
原式=x+{3x-[x+2y-2x+y]}+5
=x+{3x-[-x+3y]}+5
=x+{3x+x-3y}+5
=x+4x-3y+5
=5x-3y+5.
计算:x+{3x-[(x+2y)-(2x-y)]}+5.
原式=x+{3x-[x+2y-2x+y]}+5
=x+{3x-[-x+3y]}+5
=x+{3x+x-3y}+5
=x+4x-3y+5
=5x-3y+5.