Question

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.

Answer 1

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;