当x取什么值时,代数式4x+3与-5x+6的值为(1)相等?(2)互为相反数?(3)和为1?
人气：329 ℃ 时间：2019-11-01 09:26:59
解答
(1)相等
4x+3=-5x+6
4x+5x=6-3
9x=3
x=1/3
(2)互为相反数
4x+3+(-5x+6)=0
4x+3-5x+6=0
-x+9=0
x=9
(3)和为1
4x+3+(-5x+6)=1
4x+3-5x+6=1
-x+9=1
x=8
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