用加减消元法解方程:1-0.3(y-2)=(x+1)/5①(y-1)/4=(4x-3)/20-0.4②用加减消元法解方程!

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用加减消元法解方程:1-0.3(y-2)=(x+1)/5①(y-1)/4=(4x-3)/20-0.4②用加减消元法解方程!

用加减消元法解方程:1-0.3(y-2)=(x+1)/5①(y-1)/4=(4x-3)/20-0.4②用加减消元法解方程!
用加减消元法解方程:1-0.3(y-2)=(x+1)/5①(y-1)/4=(4x-3)/20-0.4②
用加减消元法解方程!

用加减消元法解方程:1-0.3(y-2)=(x+1)/5①(y-1)/4=(4x-3)/20-0.4②用加减消元法解方程!
化简得0.2x+0.3y=1.4①
0.2x-0.25y=0.3 ②
①-②得0.55y=1.1
x=4,y=2