Question

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

 

Answer 1

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Answer 2

Bài giải 

Ta có :

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

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

\(=\frac{16,2\times9,4-7,8\times9,4}{0,8+0,8+0,8}\)

\(=32,9\)

Vậy  ............

Answer 3

cảm ơn cậu

Answer 4

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

\(=\frac{9,4.\left(16,2-7,8\right)}{0,8x3}\)

\(=32,9\)