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一、填空题(共40分,每小题2分) 1.-(-2)的相反数是___。 2.把多项式2xy~2-x~2y-x~3y~3-7按x作升幂排列是_________。 3.如果x=5,y=7满足kx-2y=1,那么,k=
I. Fill in the blanks (40 points total, 2 points for each question) The opposite number of 1.-(-2) is ___. 2. The polynomials 2xy~2-x~2y-x~3y~3-7 are arranged in ascending power as x is _________. 3. If x=5 and y=7 satisfies kx-2y=1, then k=