Mathematics
Senior High

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3 次の2次不等式を解け。 (1) x2-2x+3 < 0 (3) -x2+3x-50 (2) 2x2+5x+4≧0 (4) -2x≧3x2+1
4 次の2次不等式を解け。 2 (1) x² +7x+6≤0 (3) 9x² +24x+16≤0 (2) -x²+2x+4≤0 (4) -2x²-6x-5>0

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