a.\(2\frac{1}{3}\)+(-0,75)
b.(-2,75)+(-3,4)
c.(-2,75).(-2,5)
d.(\(\frac{-3}{4}\))2
Câu 21. Dãy số nào được xếp theo thứ tự từ lớn đến bé?
a.1/4; 0,75; 2,5; 2,75; 2 b. 1/4 ; 0,75 ; 2 ; 2,5 ; 2,75
c. 2,75; 2,5 ; 2; 1/4 ; 0,75 d. 2,75; 2,5; 2; 0,75; 1/4
Câu 22. Dãy số nào được xếp theo thứ tự từ béđến lớn?
a.1/2; 0,25; 1,5; 0,75; 2 b.0,25; 0,75; 1,5; 2; 1/2
c.1/2; 0,25; 1,5; 2; 0,75 d. 0,25; 1/2; 0,75; 1,5; 2
tính hợp lí
a) 2,5 - \(\dfrac{-10}{15}\) b) 6,25 +[1,75-(0,75-2,75)]
c) \(\dfrac{8^5X27^2}{3^7X32^4}\) d)\(2\dfrac{3}{5}\)x(-2021)-235,91+0,55x94
nhanh lên cần gấp!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
tính A= \(\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2-\frac{3}{4}\left(\frac{1}{3}-\frac{2}{7}\right)}\)
a) \(\frac{-1}{3}-\frac{8}{35}+\frac{-2}{9}-\frac{1}{135}+\frac{4}{5}+\frac{-4}{9}+\frac{3}{7}\)
b) \(\frac{0,75+0,6-\frac{3}{7}-\frac{3}{13}}{2,75+2,2-\frac{11}{7}-\frac{11}{13}}\)
a,\(\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{13}}\)
b,\(\frac{5}{9}:\left(\frac{1}{3}+\frac{1}{4}\right)+\frac{5}{9}:\left(\frac{1}{9}+\frac{2}{3}\right)\)
giup minh voi!!!!
\(a,\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{13}}\)
\(=\frac{\frac{3}{4}-\frac{3}{5}+\frac{3}{7}+\frac{3}{13}}{\frac{11}{4}-\frac{11}{5}+\frac{11}{7}+\frac{11}{13}}\)
\(=\frac{3\left[\frac{1}{4}-\frac{1}{5}+\frac{1}{7}+\frac{1}{13}\right]}{11\left[\frac{1}{4}-\frac{1}{5}+\frac{1}{7}+\frac{1}{13}\right]}=\frac{3}{11}\)
Câu b tương tự
#)Giải :
b)\(\frac{5}{9}:\left(\frac{1}{3}+\frac{1}{4}\right)+\frac{5}{9}:\left(\frac{1}{9}+\frac{2}{3}\right)\)
\(=\frac{5}{9}:\frac{1}{3}+\frac{5}{9}:\frac{1}{4}+\frac{5}{9}:\frac{1}{9}+\frac{5}{9}:\frac{2}{3}\)
\(=\frac{5}{9}:\left(\frac{1}{3}+\frac{1}{4}+\frac{1}{9}+\frac{2}{3}\right)\)
\(=\frac{5}{9}:\frac{49}{36}\)
\(=\frac{20}{49}\)
Đơn giản biểu thức: \(B=\frac{0,75-30\%+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+1\frac{4}{7}+3\frac{2}{3}}\)
Nhanh tay!!!
Và tìm x: \(\frac{-2}{x}=\frac{-x}{8}=\frac{-x}{\frac{8}{25}}\)
Trả lời:
\(B=\frac{0,75-30\%+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+1\frac{4}{7}+3\frac{2}{3}}\)
\(B=\frac{\frac{3}{4}-\frac{3}{10}+\frac{3}{7}+\frac{3}{13}}{\frac{11}{4}-\frac{11}{5}+\frac{11}{7}+\frac{11}{3}}\)
\(B=\frac{2019}{1820}\div\frac{2431}{420}\)
\(B=\frac{2019}{1820}\times\frac{420}{2431}\)
\(B=\frac{6057}{31603}\)
B=\(\frac{5}{7}.\frac{14}{11}-\frac{5}{7}.\frac{5}{11}-\frac{5}{11}.\frac{2}{7}\)
C=\(1+\frac{2}{6}+\frac{2}{12}+\frac{2}{20}+\frac{2}{30}+\frac{2}{42}\)
D=\(\frac{0,75-0,6+\frac{3}{19}+\frac{3}{19}}{2,75-2,2+\frac{11}{19}+\frac{11}{91}}\)
Tính nhanh : C = \(\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{3}}\)
Thực hiện phép tính (bằng cách hợp lí nếu có thể)
a) \(A=9\left(\frac{-1}{3}\right)^3+\frac{1}{3}\)
b) \(B=15\frac{1}{4}:\left(\frac{-5}{7}\right)-25\frac{1}{4}:\left(\frac{-5}{7}\right)\)
c) \(C=\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{13}}\)