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Nguyễn Đức Minh
Giới thiệu về bản thân
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⇒\(\dfrac{-x}{4}\)=\(\dfrac{12}{16}\)(1);\(\dfrac{21}{y}\)=\(\dfrac{12}{16}\)(2);\(\dfrac{z}{80}\)=\(\dfrac{12}{16}\)(3)
giải(1) \(\dfrac{-x}{4}=\dfrac{12}{16
}\) giải(2) \(\dfrac{21}{y}=\dfrac{12}{16}\) giải(3)\(\dfrac{z}{80}=\dfrac{12}{16}\)
\(\dfrac{-x}{4}=\dfrac{3}{4}\) \(\dfrac{21}{y}=\dfrac{3}{4}\) \(\dfrac{z}{80}=\dfrac{3}{4}\)
⇒x=-3 \(\dfrac{21}{y}=\dfrac{21}{28}\) \(\dfrac{z}{80}=\dfrac{60}{80}\)
⇒y=28 ⇒z=60
a)9:(1-\(\dfrac{3}{8}\)-\(\dfrac{2}{5}\))=40
b)(40.\(\dfrac{3}{8}\)):40=37,5%
62,480952238095238
62,5
suy ra 1/2+2x=0(1)hay2x-3=0(2)
giải(1)1/2+2x=0 giải(2)2x-3=0
2x=0-1/2 2x=0+3
2x=-1/2 2x=3
x=-1/2:2 x=3:2
x=-1/4 x=3/2
vẫy x ϵ {-1/4;3/2}