4a-5+5a-4=0
a=1
當(dāng)a=（ 1）時(shí),代數(shù)式4a-5與5a-4的值互為相反數(shù)
當(dāng)a=（ ）時(shí),代數(shù)式4a-5與5a-4的值互為相反數(shù)
當(dāng)a=（ ）時(shí),代數(shù)式4a-5與5a-4的值互為相反數(shù)
數(shù)學(xué)人氣：766 ℃時(shí)間：2019-10-29 16:22:59
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