初一数学题,有好评已知2x²-7x+2=0.求x²+1/x²的值
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初一数学题,有好评已知2x²-7x+2=0.求x²+1/x²的值
初一数学题,有好评
已知2x²-7x+2=0.求x²+1/x²的值
初一数学题,有好评已知2x²-7x+2=0.求x²+1/x²的值
2x²-7x+2=0
2x²+2=7x
x²+1=7x/2
x+1/x=7/2
(x+1/x)²=(7/2)²
x²+1/x²+2=49/4
x²+1/x²=49/4-2
=41/4