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1.已知方程2x~2-5x+7=0,那么,( )。(A)该主程两实根之和为5/2,积为-7/2(B)该方程两实根之和为-5/2,积为7/2
1. Known equations 2x~2-5x+7=0, then, (). (A) The sum of the two real roots of the main program is 5/2, and the product is -7/2 (B) The sum of the two real roots of the equation is -5/2 and the product is 7/2.