(0.1x-0.2)/0.02+(x+1)/0.5=3 求x
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![(0.1x-0.2)/0.02+(x+1)/0.5=3 求x](/uploads/image/z/4492517-5-7.jpg?t=%EF%BC%880.1x-0.2%EF%BC%89%2F0.02%2B%EF%BC%88x%2B1%EF%BC%89%2F0.5%3D3+%E6%B1%82x)
(0.1x-0.2)/0.02+(x+1)/0.5=3 求x
(0.1x-0.2)/0.02+(x+1)/0.5=3 求x
(0.1x-0.2)/0.02+(x+1)/0.5=3 求x
(0.1x-0.2)/0.02+(x+1)/0.5=3
50(0.1x-0.2)+2(x+1)=3
5x-10+2x+2=3
7x=11
x=11/7
sin140度cos20度-cos140度cos70度
=sin140度cos20度-cos140度cos20度
=sin(140度-20度)
=sin(120度)
=√3/2