七年级下册数学课本如果-2(X-1)与4-3(X-1)互为相反数,那么X的值为 A.1/5 B.-1/5 C.-9/5 D.9/5

问题描述:

七年级下册数学课本如果-2(X-1)与4-3(X-1)互为相反数,那么X的值为 A.1/5 B.-1/5 C.-9/5 D.9/5

-2(x-1)=-[4-3(x-1)]
-2x+2=-[4-3x+3]
-2x-3x=-4-3-2
-5x=-9
x=-9/-5
x=9/5
所以选D