初一下数学课本103页第2题全部,用带入法解下列方程组:y=x+3 3s—t=5 3x+4y=16 4〔x-y-1〕=3〔1-y〕-27x+5y=9 5s+2t=15 5x-6y=33 2分之x+3分之y=2
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