3x+4y+5z=3.3和x+y+z=51和3x/5+y+5z/3=53.4帮我解一下方程组,
问题描述:
3x+4y+5z=3.3和x+y+z=51和3x/5+y+5z/3=53.4帮我解一下方程组,
答
3x+4y+5z=3.3 (1)x+y+z=51(2)3x/5+y+5z/3=53.4 即9x+15y+25z=801 (3)(2)×5-(1)2x+y=251.7 (4)(1)×5-(3)6x+5y=-784.5 (5)(4)×5-(5)4x=2043x=2043/4y=251.7-2x=-3849/5z=51-x-y=6201/20