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x:125=\(\frac{69}{115}\)
x=\(\frac{69}{115}\times125\)
x=75
\(\frac{x}{23}=\frac{x}{125}\)
\(\Rightarrow x\times23=x\times115\)
\(\Rightarrow x=0\left(tm\right)\)
\(\frac{x}{23}=\frac{x}{115}\)
\(115x=23x\)
\(115x-23x=0\)
\(92x=0\)
\(x=0\)
=.= hok tốt!!
\(=\frac{\left(15+125\right).12:2}{14.11+14.19}\)
\(=\frac{840}{14.30}\)
\(=\frac{14.30.2}{14.30}\)
\(=2\)
\(\frac{15+25+35+...+125}{14.11+14.19}\)= \(\frac{\left(125+15\right).\left(\left(125-15\right):10+1\right):2}{14\left(11+19\right)}\)= \(\frac{140.12:2}{14.20}\)= \(\frac{840}{280}\)= 3
\(\frac{69}{77}\times\frac{21}{11}=\frac{69\times21}{77\times11}=\frac{1449}{847}=\frac{207}{121}\)
\(\frac{69}{77}:\frac{21}{11}=\frac{69}{77}\times\frac{11}{21}=\frac{69\times11}{77\times21}=\frac{759}{1617}=\frac{23}{49}\)
\(\frac{66}{77}-\frac{21}{11}=\frac{66}{77}-\frac{147}{77}=\frac{66-147}{77}=\frac{-81}{77}\)
\(\frac{69}{77}+\frac{21}{11}=\frac{69}{77}+\frac{147}{77}=\frac{69+147}{77}=\frac{216}{77}\)
~ Hok tốt ~
x - 58 : 2 = 17
x - 29 = 17
x = 17 + 29
x = 46
( x - 58 ) : 2 = 17
x - 58 = 17 x 2
x - 58 = 34
x = 34 + 58
x = 92
125 + ( 145 - x ) = 175
145 - x = 175 - 125
145 - x = 50
x = 145 - 50
x = 95
\(x\times\frac{2}{5}=\frac{4}{5}:\frac{2}{3}\)
\(x\times\frac{2}{5}=\frac{6}{5}\)
\(x=\frac{6}{5}:\frac{2}{5}\)
\(x=3\)
x + 3,75 + 4x = 24,25
x + 4x = 24,25 - 3,75
x * 5 = 20,5
x = 20,5 : 5
x= 4,1
x - 58 : 2 = 17
x - 29 = 17
x = 17 + 29
x = 46
( x - 58 ) : 2 = 17
x - 58 = 17 x 2
x - 58 = 34
x = 34 + 58
x = 92
125 + ( 145 - x ) = 175
145 - x = 175 - 125
145 - x = 50
x = 145 - 50
x = 95
x.2/5=4/5:2/3
x.2/5=6/5
x=6/5:2/5
=3
x + 3,75 + 4x = 24,25
x + 4x = 24,25 - 3,75
x * 5 = 20,5
x = 20,5 : 5
x= 4,1
a, SBC là: 115 * 35 + 0 =4025
b, SBC là : 407 * 125 + 215 =51090
Tuệ Nghi <3
\(x\)=\(\frac{69.125}{115}\)=\(75\)
\(\frac{x}{125}=\frac{69}{115}\)
\(\frac{x}{125}=\frac{3}{5}\)
\(\frac{x}{125}=\frac{75}{125}\)
\(\Rightarrow x=75\)