เฉลยข้อสอบการแก้ระบบสมการ

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ขอขอบคุณ https://www.google.co.th/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0CDMQFjAE&url=http%3A%2F%2F210.246.188.54%2Ftrang1%2Fuploads%2Fschool037%2F2013-01-13_155026_3.%25E0%25B8%2582%25E0%25B9%2589%25E0%25B8%25AD%25E0%25B8%25AA%25E0%25B8%25AD%25E0%25B8%259A%25E0%25B8%2584%25E0%25B8%2593%25E0%25B8%25B4%25E0%25B8%2595_%25E0%25B8%25A1.3_%25E0%25B8%25A3%25E0%25B8%25B0%25E0%25B8%259A%25E0%25B8%25AA%25E0%25B8%25A1%25E0%25B8%2581%25E0%25B8%25B2%25E0%25B8%25A3%25E0%25B9%2580%25E0%25B8%258A%25E0%25B8%25B4%25E0%25B8%2587%25E0%25B9%2580%25E0%25B8%25AA%25E0%25B9%2589%25E0%25B8%2599%25E0%25B8%25AA%25E0%25B8%25AD%25E0%25B8%2587%25E0%25B8%2595%25E0%25B8%25B1%25E0%25B8%25A7%25E0%25B9%2581%25E0%25B8%259B%25E0%25B8%25A3_%25E0%25B8%25A3%25E0%25B8%25A7%25E0%25B8%25A1.doc&ei=nTU0VMfwJY6OuASGz4LgDw&usg=AFQjCNGnzuqwDRt4DiaFV5i-xSwBo-N_Gw&sig2=cnDLkMXclagpwKl-6OpIZA