2,5% + 10,34% = 12,84%

…. = 12,84% 

a)12,84

b)22,65

c)29,5

a) 2,5% + 10,34% = 12,84%

b) 56,9% - 34,25% = 22,65%

c) 100% - 23% - 47,5% = 77% - 47,5%

                                   = 29,5%

a) 2,5%+10.34%=11.84%

b)56.9%-34.25%=22.65%

c)100%-23%-47.5%=29.5%

a. = 12,84 %

b. = 22,65 %

c. = 29,5 %

a ) 2,5% + 10,34% = 12,84%

b ) 56,9% - 34,25% = 22,65%

c ) 100% - 23% - 47,5% = 29,5%

a) 2,5% + 10,34% = 12,84%

b) 56,9% - 34,25 = 22,65%

c) 100% - 23% - 47,5% = 29,5%

#Học Tốt !

b: =325/47

c: =2384/435

a) 3,14.7,652 = 24,02728

b) (-10,3125): 2,5 = -4,125

c) 54,369 : (-4,315) = -12,6

a)3,14.7,652=24,02728

b)(-10,3125):2,5=-4,125

c)54,369:(-4,315)=-12,6

   A , 7 giờ 32 phút   B, 5 giờ 21 phút

A ,  7 giờ 32 phút     B,  5 phút 21 giây.        

a: =340p+150p-38p

=452p

b: =390s-225s+156s

=321s

\(\begin{array}{l}a)\frac{{ - 6}}{{18}} + \frac{{18}}{{27}}\\ = \frac{{ - 1}}{3} + \frac{2}{3}\\ = \frac{1}{3}\\b)2,5 - ( - \frac{6}{9})\\ = \frac{{25}}{{10}} + \frac{6}{9}\\ = \frac{5}{2} + \frac{2}{3}\\ = \frac{{15}}{6} + \frac{4}{6}\\ = \frac{{19}}{6}\\c) - 0,32.( - 0,875)\\ = \frac{{ - 32}}{{100}}.( - \frac{{875}}{{1000}})\\ = \frac{{ - 8}}{{25}}.(\frac{{ - 7}}{8})\\ = \frac{8}{{25}}.\frac{7}{8}\\ = \frac{7}{{25}}\\d)( - 5):2\frac{1}{5}\\ = ( - 5):\frac{{11}}{5}\\ = ( - 5).\frac{5}{{11}}\\ = \frac{{ - 25}}{{11}}\end{array}\)