解方程:x-4x²-3=10 2x-5x²+7=0(1)x-4x²-3=10 (2)2x-5x²+7=0
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解方程:x-4x²-3=10 2x-5x²+7=0(1)x-4x²-3=10 (2)2x-5x²+7=0
解方程:x-4x²-3=10 2x-5x²+7=0
(1)x-4x²-3=10 (2)2x-5x²+7=0
解方程:x-4x²-3=10 2x-5x²+7=0(1)x-4x²-3=10 (2)2x-5x²+7=0
解方程:
x-4x²-3=10
即4x^2-x+7=0
因为判别式=4-112《0
则方程无实数根.
2x-5x²+7=0
方程即:5x^2-2x-7=0
(5x-7)(x+1)=0
则x=7/5或-1
1.无实数根
两个虚根为
1/8-3/8*i*23^(1/2)
1/8+3/8*i*23^(1/2)
2.两个实数根为
-1
7/5