当x为何值时,4x+6与-10x+12的值满足下列条件:(1)相等;(2)和为12(3)互为相反数.当x为何值时,4x+6与-10x+12的值满足下列条件:①相等;②和为12;③互为相反数;
问题描述:
当x为何值时,4x+6与-10x+12的值满足下列条件:(1)相等;(2)和为12(3)互为相反数.
当x为何值时,4x+6与-10x+12的值满足下列条件:
①相等;
②和为12;
③互为相反数;
答
①相等:4x+6=-10x+12; 解得:4x+10x=12-6; 14x=6; x=3/7
②和为12; 4x+6+(-10x+12)=12; 解得18-6x=12; 6x=6; x=1;
③互为相反数:4x+6=-(-10x+12)=10x-12; 解得6x=18; x=3;