mk cs kq r

chờ tí

\(A=-5,13:\left(5\frac{5}{28}-1\frac{8}{9}.1,25+1\frac{16}{63}\right)\)

\(A=-5,13:\left(5\frac{5}{28}-\frac{85}{36}+1\frac{16}{63}\right)\)

\(A=-5,13:\frac{57}{14}=-\frac{63}{50}\)

\(B=\left(3\frac{1}{3}.1,9+19,5:4\frac{1}{3}\right).\left(\frac{62}{72}-\frac{4}{25}\right)\)

\(B=\left(\frac{19}{3}+\frac{9}{2}\right).\frac{631}{900}\)

\(B=\frac{65}{6}.\frac{631}{900}=\frac{8203}{1080}\)

dấu * là dấu nhân nha

a,\(\frac{1}{4}.13\frac{9}{11}+0,25.6\frac{2}{11}\)

\(=0,25.\left(13\frac{9}{11}+6\frac{2}{11}\right)\)

\(=0,25.20\)

\(=5\)

b,\(\frac{7}{8}-2\frac{5}{6}+1,25\)

\(=\frac{7}{8}-\frac{17}{6}+\frac{5}{4}\)

\(=\frac{42}{48}-\frac{136}{48}+\frac{60}{48}\)

\(=\frac{42-136+60}{48}=-\frac{34}{48}=-\frac{17}{24}\)

a) =0,25.152/11+0,25.68/11

    =0,25.( 152/11+68/11)

    =0,25.20

    =5

bạn lấy máy tính tính nhé

bn tính từng phần nhân chia trước cộng trừ sau!

A = -5,13 : (25/28 - 8/9 . 1,25 + 16/63)

   = -5,13 : (25/28 - 10/9 + 16/63)

   = -5,13 : 1/28 = -3591/25 (-143,64)

B = (1 . 1,9 + 19,5 : 4/3) . (62/75 . 4/25)

   = ( 1,9 + 117/8 ) . 248/1875

  =  661/40 . 248/1875 = 2,185...

câu trl là do bấm máy tính đó nheaaaa

\(-5,6x+2,9x-3,86=-9,8\)

\(-2,7x=-9,8+3,86\)

\(-2,7x=-5,94\)

\(x=-5,94:\left(-2,7\right)\)

\(x=2,2\)

\(A=-5,13:\left(5\frac{5}{28}-1\frac{8}{9}.1,25+1\frac{16}{63}\right)\)

\(A=-5,13:\left(\frac{145}{28}-\frac{17}{9}.\frac{5}{4}+\frac{79}{63}\right)\)

\(A=-5,13:\left(\frac{145}{28}-\frac{85}{36}+\frac{79}{63}\right)\)

\(A=-5,13:\left(\frac{355}{126}+\frac{79}{63}\right)\)

\(A=-5,13:\frac{57}{14}\)

\(A=-1,26=\frac{-63}{50}\)

\(B=\left(3\frac{1}{3}.1,9+19,5:4\frac{1}{3}\right).\left(\frac{62}{75}-\frac{4}{25}\right)\)

\(B=\left(\frac{10}{3}.\frac{19}{10}+\frac{39}{2}.\frac{3}{13}\right).\frac{2}{3}\)

\(B=\left(\frac{19}{3}+\frac{9}{2}\right).\frac{2}{3}\)

\(B=\frac{65}{6}.\frac{2}{3}\)

\(B=\frac{65}{9}\)

học tốt

a,15^8*9^7/27^7*25^4

=3^8*5^8*3^14/3^21*5^8

=3^22*5^8/3^21*5^8

=3

b,9^3/(3^4-3^3)^2

=3^6/3^8-3^6

=3^6/3^6*(3^2-1)

=3^6/3^6*8

=1/8

c,(1/2-2/3+3/4-2/5):x=11/30

=> 11/60:x=11/30

=> x=11/60:11/30

=> x=1/2

d,-3/4*x+0,7*x=1,25:1/8

=> x*(-3/4+0,7)=10

=> x*(-1/20)=10

=> x=10:(-1/20)=200

Mình làm tắt lắm mong bạn thông cảm.