(100-100x)^2+(80-80x)^2=(10√41)^2簡便計算 (100-100x)^2+(80-80x)^2=(10√41)^2 簡便計算出x,並說明原因.

(100-100x)^2+(80-80x)^2=(10√41)^2簡便計算 (100-100x)^2+(80-80x)^2=(10√41)^2 簡便計算出x,並說明原因.

100^2(1-x)^2+80^2(1-x)^2=100×41
(10000+6400)(1-x)^2=4100
(1-x)^2=1/4
1-x=±1/2
x=1/2,x=3/2