10*10*3.14x-4*4*3.14x=251.2
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10*10*3.14x-4*4*3.14x=251.2
10*10*3.14x-4*4*3.14x=251.2
10*10*3.14x-4*4*3.14x=251.2
10*10*3.14x-4*4*3.14x=251.2
314X-50.24X=251.2
263.76X=251.2
X=0.95
3.14x(10*10-4*4)=251.2
(100-16)x=251.2/3.14
84x=80
x=20/21
先把x前面的该乘的都乘了,
然后合并同类项
100*3.14x-16*3.14x=251.2
(100-16)*3.14x=251.2
84*3.14x=251.2
x=251.3/84*3.14
x=?
100X-16X=80
84X=80
X=20/21