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Hỗn số 2 1/25 2,2
Hỗn số 14 1/10 14,09
Hỗn số 7 3/20 7,15
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cho ket qua thi duoc chu dai ra dai dong lam ma minh cung dang gap lam ne ban co la ket qua khong
Câu 1: \(\frac{5}{7}\):x+\(\frac{2}{3}\)=1\(\frac{1}{3}\)
\(\frac{5}{7}\):x+\(\frac{2}{3}\)=\(\frac{4}{3}\)
\(\frac{5}{7}\):x=\(\frac{4}{3}\) - \(\frac{2}{3}\)
\(\frac{5}{7}\):x=\(\frac{2}{3}\)
x=\(\frac{5}{7}\):\(\frac{2}{3}\)
x=\(\frac{15}{14}\)
Câu 2:x*\(\frac{3}{7}\)-\(\frac{5}{14}\)=2\(\frac{1}{3}\)
x*\(\frac{3}{7}\)-\(\frac{5}{14}\)=\(\frac{7}{3}\)
x*\(\frac{3}{7}\)=\(\frac{7}{3}\)+\(\frac{5}{14}\)
x*\(\frac{3}{7}\)=\(\frac{113}{42}\)
x=\(\frac{113}{42}\):\(\frac{3}{7}\)
x=\(\frac{791}{126}\)
Câu 3: 3\(\frac{5}{7}\)-x*\(\frac{1}{3}\)=1\(\frac{13}{11}\)
\(\frac{26}{7}\)-x*\(\frac{1}{3}\)=\(\frac{24}{11}\)
x*\(\frac{1}{3}\)=\(\frac{26}{7}\)-\(\frac{24}{11}\)
x*\(\frac{1}{3}\)=\(\frac{118}{77}\)
x=\(\frac{118}{77}\):\(\frac{1}{3}\)
x=\(\frac{356}{77}\)
Bài 1:
1: =-5/24+16/27+3/4
=-5/24+18/24+16/27
=13/24+16/27
=117/216+128/216=245/216
2: =-1/3+1/3+6/7=6/7
3: \(=\dfrac{1}{2}-\dfrac{7}{12}+\dfrac{1}{2}=1-\dfrac{7}{12}=\dfrac{5}{12}\)
4: \(=-\dfrac{5}{8}+\dfrac{14}{25}-\dfrac{6}{10}=\dfrac{-125+112-120}{200}=\dfrac{-133}{200}\)
\(\left|x\right|-3+6=16\\ \left|x\right|=13\Rightarrow x=\pm13\)
\(35-\left|2x-1\right|=14\\ \left|2x-1\right|=21\\ \left(2x-1\right)^2=21^2\\ \left(2x-1+21\right)\left(2x-1-21\right)=0\\ 4\left(x+10\right)\left(x-11\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=-10\\x=11\end{matrix}\right.\)
a) Đổi : \(2\frac{1}{25}=\frac{2.25+1}{25}=\frac{51}{25}=2,04\)
Vì \(2,04<2,2\)nên \(2\frac{1}{25}<2,2\)
b) Đổi : \(14\frac{1}{10}=\frac{14.10+1}{10}=\frac{141}{10}=14,1\)
Vì \(14,1>14,09\)nên \(14\frac{1}{10}>14,09\)
c) Đổi : \(7\frac{3}{20}=\frac{7.20+3}{20}=\frac{143}{20}=7,15\)
Vì \(7,15=7,15\)nên \(7\frac{3}{20}=7,15\)
\(2\frac{1}{25}<2,2\)
\(14\frac{1}{10}>14,09\)
\(7\frac{3}{20}=7,15\)