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数学七年级下：一块电子白板和投影机各需多少钱？二元一次方程组
数学七年级下：购买一块电子白板和投影机各需多少钱？二元一次方程组应用题经典常考题型。
二元一次方程（组），三元一次方程组，应用题培优专题74/156
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