3x=15.6-7.8=7.8
x=2.6
所以5x-1.2
=13-1.2
=11.8
當(dāng)3x+7.8=15.6時,則5x-1.2=多少呢
當(dāng)3x+7.8=15.6時,則5x-1.2=多少呢
數(shù)學(xué)人氣：891 ℃時間：2020-05-08 06:31:10
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