1:-1-(3xy-x)+(1-2(2x+3y))
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1:-1-(3xy-x)+(1-2(2x+3y))
2:2x-(3x-(x-1\2)+(5x-(2\3)*(x-2)),其中x=二分之一.
1:-1-(3xy-x)+(1-2(2x+3y))
2:2x-(3x-(x-1\2)+(5x-(2\3)*(x-2)),其中x=二分之一。
2:2x-(3x-(x-1\2)+(5x-(2\3)*(x-2)),其中x=二分之一.
1:-1-(3xy-x)+(1-2(2x+3y))
2:2x-(3x-(x-1\2)+(5x-(2\3)*(x-2)),其中x=二分之一。
1:-1-(3xy-x)+(1-2(2x+3y))
=-1-3xy+x+1-2(2x+3y)
=-1-3xy+x+1--4x-6y
=-3xy-3x-6y
2:2x-(3x-(x-1\2)+(5x-(2\3)*(x-2)),其中x=二分之一.
=2x-3x+(x-1\2)+5x-(2\3)*(x-2)
=-x+x-1\2+5x-2\3x+4\3
=13\3x+5\6
=13\6+5\6
=3
=-1-3xy+x+1-2(2x+3y)
=-1-3xy+x+1--4x-6y
=-3xy-3x-6y
2:2x-(3x-(x-1\2)+(5x-(2\3)*(x-2)),其中x=二分之一.
=2x-3x+(x-1\2)+5x-(2\3)*(x-2)
=-x+x-1\2+5x-2\3x+4\3
=13\3x+5\6
=13\6+5\6
=3
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