1/4x+1/5(220-x)=50
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1/4x+1/5(220-x)=501/4x+1/5(220-x)=501/4x+1/5(220-x)=502边都*205X+880-4X=1000X=120
1/4x+1/5(220-x)=50
1/4x+1/5(220-x)=50
1/4x+1/5(220-x)=50
2边都*20
5X+880-4X=1000 X=120
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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=(x^2-5x)^2+10(x^2-5x)+24 =x^4-10x^3+25x^2+10x^2-50x+24 这是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=(x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24
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