1.-8×2^-1+根号2÷(tan30-cos45)因式分解1.x^2-y^2-4x+4解方程7x-1/2{x-1/2(x+1)}=2/3(x-1)方程组①2x/3+3y/4=0.5②4x/5+5y/6=7/15因时分解不用了
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![1.-8×2^-1+根号2÷(tan30-cos45)因式分解1.x^2-y^2-4x+4解方程7x-1/2{x-1/2(x+1)}=2/3(x-1)方程组①2x/3+3y/4=0.5②4x/5+5y/6=7/15因时分解不用了](/uploads/image/z/8367144-24-4.jpg?t=1.-8%C3%972%5E-1%2B%E6%A0%B9%E5%8F%B72%C3%B7%28tan30-cos45%29%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A31.x%5E2-y%5E2-4x%2B4%E8%A7%A3%E6%96%B9%E7%A8%8B7x-1%2F2%EF%BD%9Bx-1%2F2%28x%2B1%29%EF%BD%9D%3D2%2F3%28x-1%29%E6%96%B9%E7%A8%8B%E7%BB%84%E2%91%A02x%2F3%2B3y%2F4%3D0.5%E2%91%A14x%2F5%2B5y%2F6%3D7%2F15%E5%9B%A0%E6%97%B6%E5%88%86%E8%A7%A3%E4%B8%8D%E7%94%A8%E4%BA%86)
1.-8×2^-1+根号2÷(tan30-cos45)因式分解1.x^2-y^2-4x+4解方程7x-1/2{x-1/2(x+1)}=2/3(x-1)方程组①2x/3+3y/4=0.5②4x/5+5y/6=7/15因时分解不用了
1.-8×2^-1+根号2÷(tan30-cos45)
因式分解
1.x^2-y^2-4x+4
解方程
7x-1/2{x-1/2(x+1)}=2/3(x-1)
方程组
①2x/3+3y/4=0.5
②4x/5+5y/6=7/15
因时分解不用了
1.-8×2^-1+根号2÷(tan30-cos45)因式分解1.x^2-y^2-4x+4解方程7x-1/2{x-1/2(x+1)}=2/3(x-1)方程组①2x/3+3y/4=0.5②4x/5+5y/6=7/15因时分解不用了
1.-8×2^-1+根号2÷(tan30-cos45)
=-8×(1/2)+√2÷(√3/3-√2/2)
=-4+6√2/(2√3-3√2)
=-4-6√2(3√2+2√3)/[(3√2)^2-(2√3)^2]
=-4-(6+2√6)
=-10-2√6
因式分解
1.x^2-y^2-4x+4
=(x+y-2)(x-y-2)
解方程
7x-1/2{x-1/2(x+1)}=2/3(x-1)
7x-1/2(x-1/2x-1/2)=2/3(x-1)
7x-1/4x+1/4=2/3x-2/3
两边乘12
84-3x+3=8x-8
11x=95
x=95/11
方程组
2x/3+3y/4=0.5
即8x+9y=6 (3)
4x/5+5y/6=7/15
即24x+25y=14 (4)
(4)-(3)
16x+16y=8
两边除2
8x+8y=4 (5)
(3)-(5)
y=2,x=(6-9y)/8=-3/2