数学数学!初一的.方程题.高手快来,快!应用题请用二元一次方程,并解!快!1）3x+4y=5 -7x+9y=-5\2 的解2）如果三角形的三个内角分别是X°Y°Y°,求：1.x,y满足的关系式.2.当x=90时,y是多少?3.当y=60时,x
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