4x - 7 = 0 , 4x = 7
3y + 8 = 0 , 3y = -8
4x + 3y = 7 + (-8) = -1
絕對值出來的數是正的,開根號後的答案也是正的
兩個正數相加等於0
所以我們知道4x-7=0;3y+8=0
4x=7;3y=-8
4x+3y=7+(-8)=7-8=-1
14.若︱4x -7︱+ =0,則 4x +3y=? (A)-1 ..-阿摩線上測驗