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1.
a) 5/8 x 4/10 + 2/3 =
= 1/4+ 2/3 = 11/12
b)5/12 x 4/7+5/12 x3/7
=5/12 x (4/7 +3/7)
=5/12 x1 = 5/12
c)(4/5 + 3/10 - 1/5 ) x 6 : 4/7
= ( 8/10 + 3/10 + 2/10) x 6 x 7/4
=13/10 x 21/2
=273/20
2.
5/8 và 3/2
ta có 5/8 =10/16 ; 3/2 =24 /16
vì 24 /16 >10 /16 nên 3/2 > 5/8
b. tương tự như câu a nha
c 418/417 và 925 /926
418/417 > 1 ; 925 /926 < 1
vì 418 /417 >1 mà 925/926 < 1 nên 418 / 417 > 925 /926
chúc bạn học tốt nha !
\(8\frac{7}{10}+2\frac{3}{4}=\frac{87}{10}+\frac{11}{4}=\frac{174}{20}+\frac{55}{20}=\frac{229}{20}\)
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!!!
\(3+\frac{2}{5}-\frac{3}{4}\)X \(\frac{4}{5}\)
\(=\frac{3}{1}+\frac{2}{5}-\frac{3}{5}\)
\(=\frac{17}{5}-\frac{3}{5}\)
\(=\frac{14}{5}\)
\(3+\frac{2}{5}-\frac{3}{4}\times\frac{4}{5}\)
\(=3+\frac{2}{5}-\frac{3}{5}\)
\(=3+\frac{-1}{5}\)
\(=\frac{15}{5}+\frac{-1}{5}\)
\(=\frac{14}{5}\)
\(3+\frac{2}{5}-\frac{3}{4}\times\frac{4}{5}\)
\(=3+\frac{2}{5}+\frac{3}{5}\)
\(=3+1\)
\(=4\)
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 = \(\frac{-45}{58}\)
\(3\frac{4}{7}4\frac{2}{5}2\frac{1}{2}\)
\(=\frac{275}{7}\)
\(3\frac{1}{5}+\frac{3}{4}-\frac{1}{2}:\frac{2}{7}=\frac{16}{5}+\frac{3}{4}-\frac{7}{4}=\frac{11}{5}\)
\(3\frac{4}{7}4\frac{2}{5}2\frac{1}{2}=\frac{275}{7}\)
\(3\frac{1}{5}+\frac{3}{4}+\frac{1}{2}:\frac{2}{7}\)
\(=3\frac{1}{5}+\frac{3}{4}+\frac{7}{4}\)
\(=\frac{11}{5}\)
\(\left(\frac{2}{5}:X\right)x\frac{1}{3}=\frac{4}{5}\)
\(\left(\frac{2}{5}:X\right)=\frac{4}{5}:\frac{1}{3}\)
\(\frac{2}{5}:X=\frac{12}{5}\)
\(X=\frac{2}{5}:\frac{12}{5}\)
\(X=\frac{1}{6}\)
\(2x\left(\frac{4}{5}:X\right)=\frac{3}{7}\)
\(\frac{4}{5}:X=\frac{3}{7}:2\)
\(\frac{4}{5}:X=\frac{3}{14}\)
\(X=\frac{4}{5}:\frac{3}{14}\)
\(X=\frac{56}{15}\)
\(\left[\frac{2}{5}:x\right]\times\frac{1}{3}=\frac{4}{5}\)
\(\Leftrightarrow\frac{2}{5}:x=\frac{12}{5}\)
\(\Leftrightarrow x=\frac{2}{5}:\frac{12}{5}=\frac{2}{5}\times\frac{5}{12}=\frac{1}{1}\times\frac{1}{6}=\frac{1}{6}\)
\(2\times\left[\frac{4}{5}:x\right]=\frac{3}{7}\)
\(\Leftrightarrow\frac{4}{5}:x=\frac{3}{7}:2\)
\(\Leftrightarrow\frac{4}{5}:x=\frac{3}{7}\times\frac{1}{2}\)
\(\Leftrightarrow\frac{4}{5}:x=\frac{3}{14}\)
\(\Leftrightarrow x=\frac{4}{5}:\frac{3}{14}=\frac{4}{5}\times\frac{14}{3}=\frac{56}{15}\)
\(a,\)\(\left(\frac{2}{5}\div x\right)\times\frac{1}{3}=\frac{4}{5}\)
\(\Rightarrow\frac{2}{5}\div x=\frac{4}{5}\div\frac{1}{3}\)
\(\Rightarrow\frac{2}{5}\div x=\frac{12}{5}\)
\(\Rightarrow x=\frac{2}{5}\div\frac{12}{5}=\frac{2.5}{5.12}=\frac{1}{6}\)
\(b,2\times\left(\frac{4}{5}\div x\right)=\frac{3}{7}\)
\(\Rightarrow\frac{4}{5}\div x=\frac{3}{14}\)
\(\Rightarrow x=\frac{4}{5}\div\frac{3}{14}=\frac{4.14}{5.3}=\frac{56}{15}\)
Bài làm
\((\frac{2}{5}:x).\frac{1}{3}=\frac{4}{5}\)
\(\frac{2}{5}:x=\frac{12}{5}\)
\(x=\frac{1}{6}\)
\(a.\left(\frac{2}{5}:X\right).\frac{1}{3}=\frac{4}{5}\)
\(\frac{2}{5}:X=\frac{4}{5}:\frac{1}{3}=\frac{12}{5}\)
\(X=\frac{2}{5}:\frac{12}{5}=\frac{1}{6}\)
\(B.2.\left(\frac{4}{5}:X\right)=\frac{3}{7}\)
\(\frac{4}{5}:X=\frac{3}{7}:2=\frac{3}{14}\)
\(X=\frac{4}{5}:\frac{3}{14}=\frac{56}{15}\)
~ Hok tốt ~
Bài làm
\(2.(\frac{4}{5}:x)=\frac{3}{7}\)
\(\frac{4}{5}:x=\frac{3}{14}\)
\(x=\frac{56}{15}\)
\(\left(\frac{2}{5}:x\right).\frac{1}{3}=\frac{4}{5}\Rightarrow\frac{2}{5x}.\frac{1}{3}=\frac{4}{5}\Rightarrow\frac{2}{15x}=\frac{4}{5}\Rightarrow\frac{1}{x}=6\Rightarrow x=\frac{1}{6}\)
vậy \(x=\frac{1}{6}\)
\(2.\left(\frac{4}{5}:x\right)=\frac{3}{7}\Rightarrow\frac{4}{5}:x=\frac{3}{14}\Rightarrow x=\frac{56}{15}\)
Vậy \(x=\frac{56}{15}\)
\(\left(\frac{2}{5}:x\right)\times\frac{1}{3}=\frac{4}{5}\)
\(\frac{2}{5}:x=\frac{4}{5}:\frac{1}{3}\)
\(=>\frac{2}{5}:x=\frac{12}{5}\)
\(x=\frac{2}{5}:\frac{12}{5}\)
\(x=\frac{2}{12}\)
\(x=\frac{1}{6}\)
\(2\times\left(\frac{4}{5}:x\right)=\frac{3}{7}\)
\(\frac{4}{5}:x=\frac{3}{7}:2\)
\(=>\frac{4}{5}:x=\frac{3}{14}\)
\(x=\frac{4}{5}:\frac{3}{14}\)
\(x=\frac{56}{15}\)