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\(2\frac{4}{5}.x-50:\frac{2}{3}=51\)
\(\frac{14}{5}.x-50:\frac{2}{3}=51\)
\(\frac{14}{51}.x=51+50:\frac{2}{3}\)
\(\frac{14}{51}.x=51+75\)
\(\frac{14}{51}.x=126\)
\(x=126:\frac{14}{51}\)
x=459
Vậy x=459
\(\frac{2}{3}.x=\frac{5}{12}=>x=\frac{5}{12}:\frac{2}{3}=\frac{5.3}{12.2}=\frac{15}{24}\)=\(\frac{3}{8}\)
vậy x=3/8
\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
\(\Rightarrow\left(\frac{14}{5}x-50\right)=51.\frac{2}{3}\)
\(\Rightarrow\frac{14}{5}x-50=34\)
\(\Rightarrow\frac{14}{5}x=34+50\)
\(\Rightarrow\frac{14}{5}x=84\)
\(\Rightarrow x=84:\frac{14}{5}\)
\(\Rightarrow x=84.\frac{5}{14}\)
\(\Rightarrow x=30\)
Vậy \(x=30\)
Chúc bạn học tốt !!!
(\(\frac{24}{5}\). x - 50 ) : \(\frac{2}{3}\) = 51
\(\frac{24}{5}\) . x - 50 = 51 . \(\frac{2}{3}\)
\(\frac{24}{5}\) . x - 50 = \(\frac{102}{3}\)
\(\frac{24}{5}\) . x - 50 = 34
\(\frac{24}{5}\) . x = 34 + 50
\(\frac{24}{5}\) . x = 84
x = 84 : \(\frac{24}{5}\)
x = \(\frac{2016}{5}\)
24 hay là 2( số nhân với mẫu rồi cộng tử) rùi đến 4 phần 5
\(\left(2\frac{4}{5}.x-50\right):\frac{2}{3}=51\)
\(\Leftrightarrow\)\(\frac{14}{5}.x-50=51.\frac{2}{3}=34\)
\(\Leftrightarrow\)\(\frac{14}{5}x=34+50=84\)
\(\Leftrightarrow\)\(x=84:\frac{14}{5}=30\)
Vậy....
\(\left(2\frac{4}{5}x-50\right):\frac{2}{3}=51\)
\(\left(\frac{14}{5}x-50\right)=51\times\frac{2}{3}\)
\(\left(\frac{14}{5}x-50\right)=34\)
\(\frac{14}{5}x=34+50\)
\(\frac{14}{5}x=84\)
\(x=84:\frac{14}{5}\)
\(x=30\)
1x2x3+2x3x4+3x4x5+4x5x6+5x6x7+6x7x8+7x8x9+8x9x10+9x10x11+10x11x12+11x12x13+12x13x14+13x14x15+14x15x16+15x16x17+16x17x18+17x18x19+18x19x20+19x20x21+20x21x22+21x22x23+22x23x24+23x24x25+24x25x26+25x26x27x26x27x28+27x28x29+28x29x30+29x30x31+30x31x32+31x32x33+32x33x34+33x34x35+34x35x36+35x36x37+36x37x38+37x38x39+38x39x40+39x40x41+40x41x42+41x42x43+42x43x44+43x44x45+44x45x46+45x46x47+46x47x48+47x48x49+48x49x50+49x50x51=n
\(\left(2\dfrac{4}{5}.x-50\right):\dfrac{2}{5}=51\)
\(=>\dfrac{14}{5}.x-50=51.\dfrac{2}{5}\)
\(=>\dfrac{14}{5}.x-50=\dfrac{102}{5}\)
\(=>\dfrac{14}{5}.x=\dfrac{102}{5}+50\)
\(=>\dfrac{14}{5}.x=\dfrac{352}{5}\)
\(=>x=\dfrac{352}{5}:\dfrac{14}{5}=\dfrac{352}{5}.\dfrac{5}{14}\)
\(=>x=\dfrac{176}{7}\)
Vậy...