x²+2x-3=0
x²+2x=3
3x²+6x-4
=3(x²+2x)-4
=3×3-4
=5
当x^2+2x减3等于0时,求代数式3x^+6x减4的值.
当x^2+2x减3等于0时,求代数式3x^+6x减4的值.
数学人气:425 ℃时间:2019-10-19 15:33:43
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