解方程组:4x-2y=14,5x+y=7.方程组:x+y/3+x-y/2=5,2(x+y)-3(x-y)=6.可化为:2(x+y)+3(x-y)=( )①2(x+y)-3(x-y)= ( )②由①+②,得4(x+y)=( )所以x+y=( )由①-②=( )③由①-②,得6(x-y

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