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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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
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)=( )①
2(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)=( )
所以x-y=( )④
解由③、④组成的方程组,可求得:x=( ),y=( )
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
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)=(30 )①
2(x+y)-3(x-y)= (6 )②
由①+②,得4(x+y)=(36 )
所以x+y=( 9) ③
由①-②,得6(x-y)=( 24)
所以x-y=( 4) ④
解由③、④组成的方程组,可求得:x=(13/2 ),y=(5/2 )
方程组4x-2y=14
5x+y=7
整理可得
2x-y=7①
5x+y=7②
①+②得
7x=14
x=2
把x=2带入①得
y=-3
所以方程组的解是x=2
y=一3
可化为:2(x+y)+3(x-y)=(30 )①
2(x+y)-3(x-y)= (6 )②
由①+②,得4(x+y)=(36 )
所以x+y=( 9) ③
由①-②,得6(x-y)=( 24)
所以x-y=( 4) ④
解由③、④组成的方程组,可求得:x=(13/2 ),y=(5/2 )