A:由2x﹣1=3得2x=3﹣1
B:由2x﹣3(x+4)=5得2x﹣3x﹣4=5
C:由﹣75x=76得x=﹣ 7576
D:由2x﹣(x﹣1)=1得2x﹣x=0
_________ he was very tired, he continued working in his office.
镀铬金属既漂亮又耐腐蚀性,为了解金属铬与铝、铜在金属活动性顺序中的相对位置关系,同学们进行了如下探究活动.
--_____ do you live from your school?--About ten minutes' walk.