\(\Leftrightarrow x+1,5x+3,5x=252\)

<=>6x=252

<=>x=42

ủng hộ nhe

thank you

\(x+x\times\frac{1}{3}:\frac{2}{9}+x:\frac{2}{7}=252\)

\(x+x\times\frac{3}{2}+x\times\frac{7}{2}=252\)

\(x\times\left(1+\frac{3}{2}+\frac{7}{2}\right)=252\)

\(x\times6=252\)

\(x=252:6\)

\(x=42\)

X + X x \(\frac{1}{3}\)x\(\frac{9}{2}\)+ X x\(\frac{7}{2}\)= 252

X + X x \(\frac{3}{2}\)+ X x \(\frac{7}{2}\)= 252

X x (\(\frac{3}{2}\)+ \(\frac{7}{2}\)+1) = 252

X x (\(\frac{3}{2}\)+ \(\frac{7}{2}\)+ \(\frac{2}{2}\)) = 252

X x 6 = 252

X = 252 : 6

X= 42

Chúc bạn học tốt! ^^

a ) \(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)

\(x\times1+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)

\(x\times1+x\times\frac{1}{3}\times\frac{9}{2}+x\times\frac{7}{2}=252\)

\(x\times1+x\times\frac{9}{6}+x\times\frac{7}{2}=252\)

\(x\times\left(1+\frac{9}{6}+\frac{7}{2}\right)=252\)

\(x\times6=252\)

\(x=252\div6\)

\(x=42\)

b ) \(\left(3\times x-0,8\right)\div x+14,5=15\)

\(\left(3\times x-0,8\right)\div x=15-14,5\)

\(\left(3\times x-0,8\right)\div x=0,5\)

\(0,8\div x=3-0,5\)

\(0,8\div x=2,5\)

\(x=0,8\div2,5\)

\(x=0,32\)

3528/39

\(x+x\times\frac{1}{3}\div\frac{2}{9}+x\div\frac{2}{7}=252\)

\(\Leftrightarrow x+x\times\frac{1}{3}\times\frac{9}{2}+x\times\frac{7}{2}=252\)

\(\Leftrightarrow x\left(1+\frac{1}{3}\times\frac{9}{2}+\frac{7}{2}\right)=252\)

\(\Leftrightarrow x\left(\frac{6}{6}+\frac{9}{6}+\frac{21}{6}\right)=252\)

\(\Leftrightarrow x\times\frac{36}{6}=252\)

\(\Leftrightarrow x\times6=252\)

\(\Leftrightarrow x=252\div6\)

\(\Leftrightarrow x=43\)

<=>x.1+x.3/2+x.7/2=252

x.(1+3/2+7/2)=252

x.6=252

x=252:6

=>x=42

\(\left(a\right)\frac{3}{5}\cdot\frac{8}{21}\cdot\frac{5}{3}=\left(\frac{3}{5}\cdot\frac{5}{3}\right)\cdot\frac{8}{21}=1\cdot\frac{8}{21}=\frac{8}{21}\)

(b) sai đề

\(\left(c\right)x\cdot\frac{1}{2}=\frac{1}{3}\)

\(x=\frac{\frac{1}{3}}{\frac{1}{2}}=\frac{2}{3}\)

\(\left(d\right)\frac{x}{\frac{4}{5}}=\frac{5}{2}\)

\(x=\frac{5}{2}\cdot\frac{4}{5}=2\)

\(\left(e\right)\frac{\frac{2}{9}}{x}=\frac{2}{3}\)

\(x=\frac{\frac{2}{9}}{\frac{2}{3}}=\frac{1}{3}\)

Câu hỏi của Mạnh Khuất - Toán lớp 7 - Học toán với OnlineMath

a) \(\left(x+\frac{7}{4}\right)\times\frac{3}{2}=6\)

\(\Leftrightarrow\left(x+\frac{7}{4}\right)=6\div\frac{3}{2}\)

\(\Leftrightarrow x+\frac{7}{4}=4\)

\(\Leftrightarrow x=4-\frac{7}{4}\)

\(\Leftrightarrow x=\frac{9}{4}\)

b) \(x\div\frac{3}{5}+\frac{2}{5}=\frac{9}{5}\)

\(\Leftrightarrow x\div\frac{3}{5}=\frac{9}{5}-\frac{2}{5}\)

\(\Leftrightarrow x\div\frac{3}{5}=\frac{7}{5}\)

\(\Leftrightarrow x=\frac{7}{5}\times\frac{3}{5}\)

\(\Leftrightarrow x=\frac{21}{25}\)

c) \(\frac{1}{2}\div3+x=\frac{5}{3}\)

\(\Leftrightarrow\frac{1}{6}+x=\frac{5}{3}\)

\(\Leftrightarrow x=\frac{5}{3}-\frac{1}{6}\)

\(\Leftrightarrow x=\frac{3}{2}\)

học đi