Question

已知X+Y=-4,怎样求二分之一X+Y-4X-Y+3X+Y-二分之三X+Y+X-Y的值

二分之一乘以括号X+Y加-4乘以括号X-Y加3乘以括号X-Y负二分之三乘以括号X+Y加括号X－Y的值

Answer 1

X+Y=-4
二分之一乘以括号X+Y加-4乘以括号X-Y加3乘以括号X-Y负二分之三乘以括号X+Y加括号X－Y
=1/2(x+y)-4(x-y)+3*(x-y)-3/2(x+y)+(x-y)
=-(x+y)
=4

Answer 2

已知A-B=﹣六分之五，则3-（B-A）=3又六分之五8-6A+6B ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~·

Answer 3

1/2（x+y）-4（x-y）+3（x-y）-3/2（x+y）+（x-y）
=-(x+y)
=-(-4)
=4

Answer 4

X+Y=-4
二分之一乘以括号X+Y加-4乘以括号X-Y加3乘以括号X-Y负二分之三乘以括号X+Y加括号X－Y
=1/2(x+y)-4(x-y)+3*(x-y)-3/2(x+y)+(x-y)
=-(x+y)
=4

Answer 5

-x-y=4 保证对，我们老师都批过了

Answer 6

展开X,Y再合并啊等于4