3( )5=(3+5)/2=4 12()2=(12+2)/2=7 1/3( )3/7=(1/3+3/7)/2=8/21 试求5.5( )X=7的未知数X
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![3( )5=(3+5)/2=4 12()2=(12+2)/2=7 1/3( )3/7=(1/3+3/7)/2=8/21 试求5.5( )X=7的未知数X](/uploads/image/z/429366-30-6.jpg?t=3%28+%295%3D%283%2B5%29%2F2%3D4+12%28%292%3D%2812%2B2%29%2F2%3D7+1%2F3%28+%293%2F7%3D%281%2F3%2B3%2F7%29%2F2%3D8%2F21+%E8%AF%95%E6%B1%825.5%28+%29X%3D7%E7%9A%84%E6%9C%AA%E7%9F%A5%E6%95%B0X)
3( )5=(3+5)/2=4 12()2=(12+2)/2=7 1/3( )3/7=(1/3+3/7)/2=8/21 试求5.5( )X=7的未知数X
3( )5=(3+5)/2=4 12()2=(12+2)/2=7 1/3( )3/7=(1/3+3/7)/2=8/21 试求5.5( )X=7的未知数X
3( )5=(3+5)/2=4 12()2=(12+2)/2=7 1/3( )3/7=(1/3+3/7)/2=8/21 试求5.5( )X=7的未知数X
∵3( )5=(3+5)/2=4
12()2=(12+2)/2=7
1/3( )3/7=(1/3+3/7)/2=8/21
∴5.5( )X=﹙5.5+x﹚/2=7
∴X=14-5.5=8.5