bằng 102.8364286 r t giải cho

Ta có: \(16,2\times3,7+5,7\times16,2-7,8\times4,8-4,6\times7,8\)

\(=16,2\times\left(3,7+5,7\right)-7,8\times\left(4,8+4,6\right)\)

\(=16,2\times9,4-7,8\times9,4=9,4\times\left(16,2-7,8\right)=9,4\times8,4\)

Ta có: 11,2+12,3+13,4-12,6-11,5-10,4

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

=0,8+0,8+0,8

=2,4

Ta có: \(\frac{16,2\times3,7+5,7\times16,2-7,8\times4,8-4,6\times7,8}{11,2+12,3+13,4-12,6-11,5-10,4}\)

\(=\frac{9,4\times8,4}{2,4}=9,4\times3,5=32,9\)

Bằng  \(\frac{987}{155}\). Chắc 100% luôn

Các bạn tk mình nhé! ^-^

32.9 chac chan100%

16×2×3×7-5×7×16×2-7×8×4×8-4-6-7-8

=(16×2×7)×3-(16×2×7)×5-(7×8×4)×8-(4×7×8)×6

=224×3-224×5-224×8-224×6

=224×(3-5-8-6)

=224×(-16)

= -3584

mk ko biết là sai hay đúng đâu

http://olm.vn/hoi-dap/question/295499.html

1 1.2 + 1 2.3 + 1 3.4 + ... + 1 2018.2019 = 2 − 1 1.2 + 3 − 2 2.3 + ... + 2019 − 2018 2018.2019 = 1 1 − 1 2 + 1 2 − 1 3 + ... + 1 2018 − 1 2019 = 1 − 1 2019 = 2018 2019