X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,
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X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,
X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,
X/3*0.5+(88-X)/4*0.7=15这个方程怎么解,
两边乘以120得
20x+21(88-x)=1800
1848-x=1800
x=48
先都化为分数形式 x/6 + 7*(88-x)/40 =15
同时乘以最小公倍数120, 20x + 21*(88-x) =15*120
-x = 15*120-21*88 = 3*5*15*8 - 3*7*11*8 =3*8*(5*15 - 7*11) = 3*8*(-2)
x = 48
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 ||
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一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X
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难倒爱因斯坦的九宫格X 7 X | X 8 1 | X X X |X X X | X 4 X | 7 5 9 |X X 5 | 7 X 9 | X 1 4 |5 X X | X X 8 | 3 9 X |3 9 6 | 4 X 7 | X X 2 |X 8 7 | 9 X X | X X X |4 X X | 6 X 5 | X X X | X X 4 | X X 1 |2 X X | X X X | X X X | X 3 X | X X X |X 6
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