12x+24y=60 16*0.8x+27*0.8y=60 化简求值
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12x+24y=60 16*0.8x+27*0.8y=60
化简求值
12x+24y=60 ..(1)
16*0.8x+27*0.8y=60 ..(2)
(1)等式两边同时除以4,化简得
3x+6y=15 ..(3)
(2)等式两边同时乘以5/4,化简得到
16x+27y=75 ..(4)
(4)*2-(3)*9,得
5x=15
x=15/5=3
带入(3),得
y=1
综上
x=3,y=1
如仍有疑惑,欢迎追问.祝:
12x+24y=60 16*0.8x+27*0.8y=60
x+2y=5 16x+27y=75
(1)*16-(2 )5y=5 y=1 x=3
(1)12x+24y=60(化简,两边同时除12,得(3)
(3)x+2y=5(两边同时×16)得(5)
(2) 16*0.8x+27*0.8y=60(化简,两边同时÷4)
16*0.2x+27*0.2y=15
3.2x+5.4y=15(两边同时×5,得(4)
(4)16x+27y=75
(5)16x+32y=80(与(4)相减)
5y=5<...
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(1)12x+24y=60(化简,两边同时除12,得(3)
(3)x+2y=5(两边同时×16)得(5)
(2) 16*0.8x+27*0.8y=60(化简,两边同时÷4)
16*0.2x+27*0.2y=15
3.2x+5.4y=15(两边同时×5,得(4)
(4)16x+27y=75
(5)16x+32y=80(与(4)相减)
5y=5
y=1(代入到(3)
x=5-2y=3
验算:
(1)12*3+24*1=60
(2)16*0.8*3+27*0.8*1=60
收起
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12x+24y=60 16*0.8x+27*0.8y=60 化简求值
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