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(1)x-5y-3z=-4兩邊同時×3得(5)(2)3x+5y+z=-2(3)x-3y-5z=-6與(1)相减得(4)(4)2y-2z=-2y-z=-1(5)3x-15y-9z=-12(與(2)相减)(2)3x+5y+z=-220y+10z=10(÷10)2y+z=1與y-z=-1相加3y=0y=0z=1x=…
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