Question

help me!!!!!

chú thích: phân số viết dạng a/b

hỗn số viết dạng a b/c

a) ( 4 1/9 + 3 1/4) . 2 1/4 + 2 3/4

b) 1+ ( 9/10 - 4/5) : 3 1/6

c) (-7 + |13|)-(13 - |-7| - 25)-(25 + |-10| -9)

Answer 1

a) \(\left(4\dfrac{1}{9}+3\dfrac{1}{4}\right).2\dfrac{1}{4}+2\dfrac{3}{4}\)

\(=\left(\dfrac{37}{9}+\dfrac{13}{4}\right).\dfrac{9}{4}+\dfrac{11}{4}\)

\(=\left(\dfrac{148}{36}+\dfrac{117}{36}\right).\dfrac{9}{4}+\dfrac{11}{4}\)

\(=\left(\dfrac{148+117}{36}\right).\dfrac{9}{4}+\dfrac{11}{4}\)

\(=\dfrac{265}{36}.\dfrac{9}{4}+\dfrac{11}{4}\)

\(=\dfrac{265.9}{36.4}+\dfrac{11}{4}\)

\(=\dfrac{265.1}{4.4}+\dfrac{11}{4}\)

\(=\dfrac{265}{16}+\dfrac{11}{4}\)

\(=\dfrac{265}{16}+\dfrac{44}{16}\)

\(=\dfrac{309}{16}\)