a: \(=\dfrac{\left(1.6-1.6\right)\cdot\left(2.29-0.76\right)}{1.6+2.53}\cdot\dfrac{3.06:7.5+3.4\cdot0.38}{19-2.6\cdot0.5}=0\)

b: \(=\dfrac{17.8\cdot9.4-7.8\cdot9}{3-0.3\cdot0.3}=\dfrac{97.12}{2.4}=\dfrac{607}{15}\)

\(\frac{17,8.3,7-7,8.4,8+5,7.17,8-4,6.7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)

\(=\frac{17,8\left(3,7+5,7\right)-7,8\left(4,8+4,6\right)}{\left(13,4-12,6\right)+\left(12,3-11,5\right)+\left(11,2-10,4\right)}\)

\(=\frac{17,8.9,4-7,8.9,4}{0,8+0,8+0,8}\)

\(=119,1\)

\(=\dfrac{16.2\cdot9.4-7.8\cdot9.4}{2,4}=\dfrac{8.4\cdot9,4}{2,4}=32.9\)

  Đây nha

\(=\frac{16,2\cdot\left(3,7+5,3\right)-7,8\cdot\left(4,8+4,6\right)}{\left(13,4-12,6\right)+\left(12,3-11,5\right)+\left(11,2-10,4\right)}=\frac{16,2\cdot9-7,8\cdot9,4}{3\cdot0,8}=30,2\)

=1 day 

\(\frac{16,2.3,7+5,7.16,2-7,8.4,8-4,6.7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)

\(=\)\(\frac{16,2\left(3,7+5,7\right)-7,8\left(4,8-4,6\right)}{\left(11,2+12,3+13,4\right)-\left(12,6+11,5+10,4\right)}\)

\(=\)\(\frac{16,2.9-7,8.0,2}{36,9-34,5}\)

\(=\)\(\frac{145,8-1,56}{2,4}\)

\(=\)\(\frac{144,24}{2,4}\)

\(=\)\(60,1\)

\(\text{Học tốt!!!}\)

cảm ơn

a) 16,2 x 3,7 +5,7 x 16,2 - 7,8 x4,8 - 4,6 x 7,8

=16 x (3,7+5,7) - 7,8 x (4,8 - 4,6)

=16 x 9,4 - 7,8 x 0,2

=150,4 - 1,56

=148,84

b)11,2 + 12,3 + 13,4 - 12,6 - 11,5 - 10,4

=23,5 + 13,4 - 12,6 - 11,5 - 10,4

=36,9 -12,6 - 11,5 - 10,4

=24,3 - 11,5 - 10,4

=12,8 - 10,4

=2,4

gạch chân _________________________ là phần nha

\(\frac{16,2x3,7+5,7x16,2-7,8x4,8-4,6x7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)

\(=\frac{16,2x\left(3,7+5,7\right)-7,8x\left(4,8+4,6\right)}{\left(11,2+12,3+13,4\right)-\left(12,6+11,5+10,4\right)}\)

\(=\frac{16,2x9,4-7,8x9,4}{36,9-34,5}\)

\(=\frac{9,4x\left(16,2-7,8\right)}{2,4}=\frac{9,4x8,4}{2,4}=\frac{78,96}{2,4}=32,9\)