Question

[hoàng thị trà ly]

a)22/5+51/9+11/4+3/5+1/3+1/4.                                 b)13/50+0,09+41/100+0,24.                                           c)20,11×36+63×20,11+20,11.                                         d)0,9×438×2+1,8×252+0,6×310×3.                               e)2,5+4,43-3,21+6,5-2,79.                                               g)(6÷3/5-7/6×6/7)÷(21/5×10/11+57/11).                    f)1/1×2+1/2×3+1/3×4+....+1/18×19+1/19×20

Cảm ơn mọi người giúp mình nhé 😘😊😁😂😀😉😋😃😍😍😍

Answer 1

[I have a crazy idea]

 \(\frac{22}{5}+\frac{51}{9}+\frac{11}{3}+\frac{3}{5}+\frac{1}{3}+\frac{1}{4}\)

\(=\left(\frac{22}{5}+\frac{3}{5}+\frac{1}{4}\right)+\left(\frac{51}{9}+\frac{11}{3}+\frac{1}{3}\right)\)

\(=\left(\frac{88}{20}+\frac{12}{20}+\frac{5}{20}\right)+\left(\frac{51}{9}+\frac{33}{9}+\frac{3}{9}\right)\)

\(=\frac{105}{20}+\frac{87}{9}\)

\(=\frac{21}{4}+\frac{29}{3}\)

\(=\frac{63}{12}+\frac{116}{12}\)

\(=\frac{179}{12}\)