x(1/1×2+1/2×3+1/3×4+1/4×5)=1
x(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5)=1
x(1-1/5)=1
x(4/5)=1
x=5/4
2分之x加6分之x加12分之x加20分之x等于1 求x的值
2分之x加6分之x加12分之x加20分之x等于1 求x的值
数学人气:873 ℃时间:2020-04-03 09:11:07
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