2x+3x+4x+5x+x+6x+7x=100
4个回答
2x+3x+4x+5x+x+6x+7x=100
28x=100
x=100/28
x=25/7
相关问题
100/4=4X-6 X-10=160-X 7(X+6)-3X=4(2X+5)
f(x)=7x^7+6x^6+5x^5+4x^4+3x^3+2x^2+x
1/2X3X4X5+1/3X4X5X6+1/4X5X6X7.1/97X98X99X100=?
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101
3x+4x-6=36-5x 解7乘(x-8)=31+4x(x-4)乘9=(4-x)乘7x除3+(100-x)乘2=100
1/1x2x3x4+1/2x3x4x5+1/3x4x5x6+1/4x5x6x7+1/5x6x7x8+1/6x7x8x9+
7x=2+3x 3.5x=28 5(x+8)-5=6(2x-7) 9(x-4)=7(4-x)
3x+7=4x+5,4x-6=-3+5x,2x+1-x=3-3x,3x-1=x,3x-2=5x-6,4x+5=3x+3-
因式分解:(1)x^2-7x+6(2)x^2-5x+6(3)x^2-5x-6(4)x^2-7x+8(5)x^2-7x+1