5:8=x:16解x 0.3/1.5=4.2/x 5/3:x=2:3/2
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5:8=x:16解x 0.3/1.5=4.2/x 5/3:x=2:3/2
![5:8=x:16解x 0.3/1.5=4.2/x 5/3:x=2:3/2](/uploads/image/z/18557124-60-4.jpg?t=5%3A8%3Dx%3A16%E8%A7%A3x+0.3%2F1.5%3D4.2%2Fx+5%2F3%3Ax%3D2%3A3%2F2)
1)5:8=x:16
8x =80
x=10
2) 0.3/1.5=4.2/x
0.3x=6.3
x=2.1
3) 5/3:x=2:3/2
2x=5/2
x=5/4
8x =80
x=10
2) 0.3/1.5=4.2/x
0.3x=6.3
x=2.1
3) 5/3:x=2:3/2
2x=5/2
x=5/4
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解方程5x+2x+3x+8x+6x=140-x-3x
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
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