计算 x-(4x-3y)+(2y-x) 3(a-b)-5(a-2b+1) (7a-2b)-[6a-(5b-2c)]+2c
问题描述:
计算 x-(4x-3y)+(2y-x) 3(a-b)-5(a-2b+1) (7a-2b)-[6a-(5b-2c)]+2c
答
1)原式=x-4x+3y+2y-x=-4x+5y
2)原式=3a-3b-5a+10b-5=-2a+7b-5
3)原式=7a-2b-(6a-5b+2c)+2c=7a-2b-6a+5b-2c+2c=a+3b