Of all the students in our class,she is____(care).已知方程组{3x+y=8 mx+y=n和{x+ny=m 2x-y=7有相同的解,求m.n的值.
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Of all the students in our class,she is____(care).已知方程组{3x+y=8 mx+y=n和{x+ny=m 2x-y=7有相同的解,求m.n的值.
Of all the students in our class,she is____(care).
已知方程组{3x+y=8 mx+y=n和{x+ny=m 2x-y=7有相同的解,求m.n的值.
Of all the students in our class,she is____(care).已知方程组{3x+y=8 mx+y=n和{x+ny=m 2x-y=7有相同的解,求m.n的值.
careful
m=1
n=2
解答过程如下:
联立方程组可知:3x+y=8且2x-y=7,求得x=3,y=-1.
再将x与y的值代入,可得方程组:3m-1=n且3-n=m.求得m=1,n=2.
carefull
m=1 n=2
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