y x 5 + y : 0,25 = 4,05
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X x 5 + X x 4 = 4,05
X x (5+4) = 4,05
X x 9 =4,05
X =4,05 : 9
X = 0,45
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X x 5 + X : 0.25 = 4.05
X x 5 + X x 4 = 4.05
X x ( 5 + 4 ) = 4.05
X x 9 = 4.05
X = 4.05 : 9
X = 0.45
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x : 0,2 + x : 0,25 = 4,05
x : ( 0,2 + 0,25 ) = 4,05
x : 0,45 = 4,05
x = 4,05 x 0,45
x = 1,8225
\(x:0,2+x:0,25=4,05\)
\(x\times5+x\times4=4,05\)
\(x\times\left(5+4\right)=4,05\)
\(x\times9=4,05\)
\(x=4,05:9\)
\(x=0,45\)
~ Thiên Mã ~
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từ đầu bài
=) x * 5 + x * 4 = 4,05
(=)x * (5 + 4) = 4,05
(=) x * 9 = 4,05
(=) x = 0.45
còn cách nhanh hơn thì tự làm nhé
x : 0,2 + x : 0,25 = 4,05
x : (0,2 + 0,25) = 4,05
x : 0,45 = 4,05
x = 4,05 : 0,45
x = 9
vậy x = 9
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\(x.0,5+x:0,25=4,05\)
\(x.0,5+x.4=4,05\)
\(x.\left(0,5+4\right)=4,05\)
\(x.4,5=4,05\)
\(\Rightarrow x=0,9\)
PP/ss: Hoq chắc ạ ((:
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a, Áp dụng dãy tỉ số bằng nhau, ta có:
\(\frac{x}{y}=\frac{5}{7}\Rightarrow\)\(\frac{x}{5}=\frac{y}{7}=\frac{x+y}{5+7}=\frac{4,05}{12}=\frac{27}{80}\)
\(\Rightarrow\)\(x=\frac{5.27}{80}=\frac{27}{16}; y=\frac{7.27}{80}=\frac{189}{80}\)
b, Có \(\frac{x}{3}=\frac{y}{5}\)\(\Rightarrow\)\(\frac{xy}{3.5}=\frac{y^2}{25}\)\(\Rightarrow\)\(\frac{1215}{15}=\frac{y^2}{25}\)
\(\Rightarrow\)\(y^2=2025\Rightarrow y=\pm45\)
y=45 => x 27
y=-45 => x=-27
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Bài làm:
x:0,2+x:0,25=4,05
x:(0,2+0,25)=4,05
x:0,45=4,05
x=11
Vậy x=11
Hok tốt
x: 0,2 + x : 0,25 = 4,05
x . 5 + x.4 = 4,05
x. ( 5+4) = 4,05
x.9 = 4,05
x = 4,05 : 9
x = 0.45
Y x 5 + Y: 0.25 = 4.05
Y x 5 + Y x 4 = 4.05
Y x ( 5 + 4 ) = 4.05
Y x 9 = 4.05
Y = 4.05 : 9
Y = 0.45
y x 5 + y : 0,25 = 4,05
y x 5 + y x 4 = 4,05
y x ( 5 + 4 ) = 4,05
y x 9 = 4,05
y = 4,05 : 9
y = 0,45.