解方程:﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49
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解方程:﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49
解方程:1.﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49
2.﹙x²-x+1﹚﹙x²-x+2﹚=12
3.x²+2﹙√2-1﹚x+3-2√2=0
解方程:1.﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49
2.﹙x²-x+1﹚﹙x²-x+2﹚=12
3.x²+2﹙√2-1﹚x+3-2√2=0
﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49
(x^2-2x-15)+(x^2+2x-8)=49
2x^2-23=49
x^2=36
x1=6,x2=-6
﹙x²-x+1﹚﹙x²-x+2﹚=12
﹙x²-x+1﹚﹙x²-x+1+1﹚=12
﹙x²-x+1﹚^2+﹙x²-x+1﹚-12=0
﹙x²-x+1+4﹚﹙x²-x+1-3﹚=0
﹙x²-x+5﹚﹙x²-x-2﹚=0
则 (x-2)(x+1)=0
x1=2,x2=-1
x²+2﹙√2-1﹚x+3-2√2=0
x²+2﹙√2-1﹚x+(√2-1)^2=0
(x+√2-1)^2=0
x=1-√2
(x^2-2x-15)+(x^2+2x-8)=49
2x^2-23=49
x^2=36
x1=6,x2=-6
﹙x²-x+1﹚﹙x²-x+2﹚=12
﹙x²-x+1﹚﹙x²-x+1+1﹚=12
﹙x²-x+1﹚^2+﹙x²-x+1﹚-12=0
﹙x²-x+1+4﹚﹙x²-x+1-3﹚=0
﹙x²-x+5﹚﹙x²-x-2﹚=0
则 (x-2)(x+1)=0
x1=2,x2=-1
x²+2﹙√2-1﹚x+3-2√2=0
x²+2﹙√2-1﹚x+(√2-1)^2=0
(x+√2-1)^2=0
x=1-√2
解方程:﹙x-5﹚﹙x+3﹚+﹙x-2﹚﹙x+4﹚=49
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