Tìm các số a, b, c, d, biết rằng :
\(a\div b\div c\div d=2\div3\div4\div5\)và \(a+b+c+d=-42\)
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29 tháng 10 2018
a) Góc A = 1
Góc B = 3
Góc C = 5
Học tốt!!!
TD
6 tháng 4 2017
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Từ \(a:b:c:d=2:3:4:5\)
\(\Rightarrow\dfrac{a}{2}=\dfrac{b}{3}=\dfrac{c}{4}=\dfrac{d}{5}\)
Áp dụng tính chất của dãy tỉ số bằng nhau ta có:
\(\dfrac{a}{2}=\dfrac{b}{3}=\dfrac{c}{4}=\dfrac{d}{5}=\dfrac{a+b+c+d}{2+3+4+5}=\dfrac{-42}{14}=-3\)
\(\Rightarrow a=-6\)
\(\Rightarrow b=-9\)
\(\Rightarrow c=-12\)
\(\Rightarrow d=-15\)