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\(8\frac{7}{10}+2\frac{3}{4}=\frac{87}{10}+\frac{11}{4}=\frac{174}{20}+\frac{55}{20}=\frac{229}{20}\)
Bạn chỉ cần đưa về phân số xong tính bình thường. Muốn đổi từ hỗn số sang phân số, ta chỉ cần lấy phần nguyên nhân cho mẫu rồi cộng với tử là xong. Chứ bạn cứ hỏi mấy bài dễ như thế này thì k giỏi đc đâu!!!
a. \(\frac{-3}{2}-2x+\frac{3}{4}=-22\)2
=> \(-2x=-22+\frac{3}{2}-\frac{3}{4}\)
=> \(-2x=\frac{-85}{4}\)
=> \(x=\frac{-85}{4}:\left(-2\right)\)
=> \(x=\frac{85}{8}\)
b. \(\left(\frac{-2}{3}x-\frac{3}{5}\right).\left(\frac{3}{-2}-\frac{10}{3}\right)=\frac{2}{5}\)
=> \(\left(\frac{-2}{3}x-\frac{3}{5}\right).\frac{-29}{6}=\frac{2}{5}\)
=> \(\frac{-2}{3}x-\frac{3}{5}=\frac{2}{5}:\left(\frac{-29}{6}\right)\)
=> \(\frac{-2}{3}x-\frac{3}{5}=\frac{-12}{145}\)
=> \(\frac{-2}{3}x=\frac{-12}{145}+\frac{3}{5}\)
=> \(\frac{-2}{3}x=\frac{15}{29}\)
=> x = \(\frac{15}{29}:\frac{-2}{3}\)
=> x = \(\frac{-45}{58}\)
\(\left(\frac{2}{5}:X\right)x\frac{1}{3}=\frac{4}{5}\)
\(\left(\frac{2}{5}:X\right)=\frac{4}{5}:\frac{1}{3}\)
\(\frac{2}{5}:X=\frac{12}{5}\)
\(X=\frac{2}{5}:\frac{12}{5}\)
\(X=\frac{1}{6}\)
\(2x\left(\frac{4}{5}:X\right)=\frac{3}{7}\)
\(\frac{4}{5}:X=\frac{3}{7}:2\)
\(\frac{4}{5}:X=\frac{3}{14}\)
\(X=\frac{4}{5}:\frac{3}{14}\)
\(X=\frac{56}{15}\)
\(\left[\frac{2}{5}:x\right]\times\frac{1}{3}=\frac{4}{5}\)
\(\Leftrightarrow\frac{2}{5}:x=\frac{12}{5}\)
\(\Leftrightarrow x=\frac{2}{5}:\frac{12}{5}=\frac{2}{5}\times\frac{5}{12}=\frac{1}{1}\times\frac{1}{6}=\frac{1}{6}\)
\(2\times\left[\frac{4}{5}:x\right]=\frac{3}{7}\)
\(\Leftrightarrow\frac{4}{5}:x=\frac{3}{7}:2\)
\(\Leftrightarrow\frac{4}{5}:x=\frac{3}{7}\times\frac{1}{2}\)
\(\Leftrightarrow\frac{4}{5}:x=\frac{3}{14}\)
\(\Leftrightarrow x=\frac{4}{5}:\frac{3}{14}=\frac{4}{5}\times\frac{14}{3}=\frac{56}{15}\)
\(a.\)\(1\frac{2}{3}:\frac{2}{3}-\frac{3}{4}\cdot\frac{2}{3}+5\frac{3}{7}\)
\(=\frac{5}{3}:\frac{2}{3}-\frac{3}{4}\cdot\frac{2}{3}+\frac{38}{7}\)
\(=\frac{5}{3}\cdot\frac{3}{2}-\frac{3}{4}\cdot\frac{2}{3}+\frac{38}{7}\)
\(=\frac{5}{2}-\frac{1}{2}+\frac{38}{7}\)
\(=\frac{4}{2}+\frac{38}{7}\)
\(=2+\frac{38}{7}\)
\(=\frac{14}{7}+\frac{38}{7}\)
\(=\frac{52}{7}\)
\(b.1\frac{1}{3}-1\frac{1}{4}:1\frac{1}{2}+2\frac{3}{4}\cdot3\frac{2}{3}\)
\(=\frac{4}{3}-\frac{5}{4}:\frac{3}{2}+\frac{11}{4}\cdot\frac{11}{3}\)
\(=\frac{4}{3}-\frac{5}{4}\cdot\frac{2}{3}+\frac{11}{4}\cdot\frac{11}{3}\)
\(=\frac{4}{3}-\frac{5}{6}+\frac{121}{12}\)
\(=\frac{16}{12}-\frac{10}{12}+\frac{121}{12}\)
\(=\frac{6}{12}+\frac{121}{12}\)
\(=\frac{127}{12}\)
\(c.7\cdot\frac{2}{3}-\frac{2}{5}:\frac{1}{2}-\frac{2}{3}\)
\(=7\cdot\frac{2}{3}-\frac{2}{5}\cdot\frac{2}{1}-\frac{2}{3}\)
\(=7\cdot\frac{2}{3}-\frac{4}{5}-\frac{2}{3}\)
\(=\frac{14}{3}-\frac{4}{5}-\frac{2}{3}\)
\(=\frac{70}{15}-\frac{12}{15}-\frac{10}{15}\)
\(=\frac{58}{15}-\frac{10}{15}\)
\(=\frac{48}{15}=\frac{16}{5}\)
\(\frac{5}{3}:\frac{2}{3}-\frac{3}{4}\cdot\frac{2}{3}+\frac{38}{7}\)
\(\frac{5}{2}-\frac{1}{2}+\frac{38}{7}\)
\(2+\frac{38}{7}\)
\(\frac{52}{7}\)
\(3+\frac{2}{5}-\frac{3}{4}\times\frac{4}{5}\)
\(=3+\frac{2}{5}+\frac{3}{5}\)
\(=3+1\)
\(=4\)
\(\frac{23}{12}\)
\(\frac{314}{105}\)
\(\frac{59}{60}\)
\(\frac{199}{90}\)
\(\frac{1}{18}\)
\(\frac{13}{36}\)
\(\frac{4}{221}\)
\(\frac{4}{85}\)
trả lời
đúng
vì x là 1
chúc bn học tốt
\(2\frac{3}{4}< 2.\frac{3}{4}\left(s\right)\)
\(2\frac{3}{4}=2\cdot\frac{3}{4}\left(s\right)\)
\(2\frac{3}{4}>2.\frac{3}{4}\left(\text{đ}\right)\)