-5^2x(3/4)+25x(1/2)-25x(1/4)=
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-5^2x(3/4)+25x(1/2)-25x(1/4)=
-5^2x(3/4)+25x(1/2)-25x(1/4)=
-5^2x(3/4)+25x(1/2)-25x(1/4)=
-5^2x(3/4)+25x(1/2)-25x(1/4)
=-25x3/4+25x1/2-25x1/4
=25x(1/2-3/4-1/4)
=25x(-1/2)
=-25/2
解九宫格题目(X为未知数)9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1
*-----------------------------------------------*| 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 ||
(x+1)(x+2)(x+3)(x+4)+1(x+1)(x-2)(x+3)(x-4)+25
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麻烦解4道分式方程(20分)(x/2x-5)+(5/5-2x)=1(x+1/x*x-2x)-(1/x)=3/x-2(1-x/5-x)-(5-x/1-x)=8/x*x-6x+5(x+1/x-1)-(4/x*x-1)=1去掉括号,不管前面正负,都不变号~