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(15/4.4-12/5.5/4)-(7/2:5/2-1/5)-1/5.x=51/5
(15-3)-(7/5-1/5)-1/5.x=51/5
12-6/5-1/5.x=51/5
54/5-1/5.x=51/5
1/5x=54/5-51/5
1/5x=3/5
x=3
a) \(x\cdot\frac{1}{2}+x\cdot\frac{1}{4}+x\cdot\frac{1}{8}=\frac{21}{24}\)
\(x\cdot\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\right)=\frac{7}{8}\)
\(x\cdot\frac{7}{8}=\frac{7}{8}\)
\(\Rightarrow x=\frac{7}{8}\div\frac{7}{8}=1\)
b) \(\left(x+4\right)+\left(x+9\right)+\left(x+14\right)+.....+\left(x+44\right)+\left(x+49\right)=1430\)
\(\left(x+x+x+....+x+x\right)+\left(4+9+14+...+44+49\right)=1430\)
\(10x+265=1430\)
\(10x=1430-265\)
\(10x=1165\)
\(\Rightarrow x=\frac{1165}{10}=116,5\)
c) \(x\cdot0,25-0,5=1\)
\(x\cdot0,25=1+0,5\)
\(x\cdot0,25=1,5\)
\(\Rightarrow x=1,5\div0,25=6\)
\(\frac{x}{142}+457=625\)
\(\frac{x}{142}=168\)
\(\Rightarrow x=168.142\)
\(\Rightarrow x=23856\)
vậy \(x=23856\)
\(x-16,7+8,6=16,9\)
\(x=16,9-8,6+16,7\)
\(x=25\)
vậy \(x=25\)
\(\left(x-1\frac{3}{4}\right)x:2\frac{1}{4}=\frac{5}{3}\)
\(\left(x-\frac{7}{4}\right)x:\frac{9}{4}=\frac{5}{3}\)
\(x^2-\frac{7}{4}x=\frac{5}{3}.\frac{9}{4}\)
\(x^2-\frac{7}{4}x=\frac{15}{4}\)
X x 2 , 5 + X x 4\(\frac{1}{2}\)+ X x 4 = 24 , 5
X x 2 , 5 + X x 4 , 5 + X x 4 = 24 , 5
X x ( 2 , 5 + 4 , 5 + 4 ) = 24 , 5
X x ( 7 + 4 ) = 24 , 5
X x 11 = 24 , 5
X = 24 , 5 : 11
X = 49/22
Vậy X = 49/22
Tham khảo nha !!!
=Xx2,5+Xx4,5+Xx4=24,5
=Xx(2,5+4,5+4)=24,5
=Xx11=24,5
X=24,5:11
X=49/22.