i) \(\dfrac{1}{2}+\dfrac{-3}{8}+\dfrac{5}{9}\)

\(=\dfrac{1}{8}+\dfrac{5}{9}\)

\(=\dfrac{49}{72}\)

k)\(\dfrac{13}{-30}+\dfrac{17}{45}+\dfrac{-7}{18}\)

\(=\dfrac{-1}{18}+\dfrac{-7}{18}\)

\(=\dfrac{-4}{9}\)

m) \(\dfrac{-5}{12}+\dfrac{4}{9}+\dfrac{-11}{6}\)

\(=\dfrac{1}{36}+\dfrac{-11}{6}\)

\(=\dfrac{-65}{36}\)

n) \(\dfrac{-7}{31}+\dfrac{24}{17}+\dfrac{7}{31}\)

\(=\left(\dfrac{-7}{31}+\dfrac{7}{31}\right)+\dfrac{24}{17}\)

\(=0+\dfrac{24}{17}\)

\(\dfrac{24}{17}\)

e) \(4\dfrac{25}{16}+25.\left(\dfrac{9}{16}:\dfrac{125}{64}:\dfrac{-27}{8}\right)\)

\(=\dfrac{89}{16}+25.\left(\dfrac{9}{16}:\dfrac{125}{64}:\dfrac{-27}{8}\right)\)

\(=\dfrac{89}{16}+25.\left(\dfrac{36}{125}:\dfrac{-27}{8}\right)\)

\(=\dfrac{89}{16}+25.\dfrac{-32}{375}\)

\(=\dfrac{89}{16}+\dfrac{-32}{15}\)

\(=\dfrac{823}{240}\)

g) \(\dfrac{2}{3}-4.\left(\dfrac{1}{2}+\dfrac{3}{4}\right)\)

\(=\dfrac{2}{3}-4.\dfrac{5}{4}\)

\(=\dfrac{2}{3}-5\)

\(=\dfrac{-13}{3}\)

a) sắp xếp theo thứ tự tăng dần:

\(\dfrac{-2}{3};\dfrac{-3}{12};\dfrac{-1}{-6};\dfrac{3}{4}\)

b)sắp xếp theo thứ tự tăng dần:

\(\dfrac{3}{-4};-\dfrac{1}{2};0;\dfrac{3}{10};\dfrac{-2}{-5};1\)

c) sắp xếp theo thứ tự tăng dần:

\(-1;\dfrac{-7}{9};\dfrac{-1}{3};0;\dfrac{-1}{-4};\dfrac{5}{12}\)

d) sắp xếp theo thứ tự tăng dần:

\(\dfrac{23}{-25};\dfrac{-7}{10};\dfrac{-2}{5};\dfrac{17}{-50};\dfrac{-37}{150}\)

bài 1 tính

a) 72 x 9=648

b) 573x4=2292

c) 64x26=1664

d) 192x12=2304

bài 2 tính

a) 92:4=23

b) 678:6=113

c) 532:7=76

d) 357:3=119

cho (x-1)²=1

có bao nhiêu giá trị x thoả mãn ?