Question

RAPIDDDDD!!!!!! DAU COROANA!!!!!!! ​

Answer 1

a) ( 1/2 + 1/5 ) x 30/49 + 5/7 = 8/7

b) 2 1/2 x 4/25 + 7/15 x 3/14 = 1/2

c) ( 3 1/2 - 1 2/3) x 36/55 = 6/5

d) 2/3 x ( 1 1/5 + 2 1/2) - ( 1/2 + 1/4 + 1/3 ) =83/60

Answer 2

Răspuns:

Explicație pas cu pas:

a). $(\frac{1}{2} +\frac{1}{5} )*\frac{30}{49} +\frac{5}{7} =(\frac{5}{10} +\frac{2}{10} )*\frac{30}{49} +\frac{5}{7} =\frac{7}{10} *\frac{30}{49} +\frac{5}{7} =\frac{3}{7} +\frac{5}{7} =\frac{8}{7}$

b). 2 1/2*4/25+7/25+7/15*3/14=5/2*4/25+7/15*3/14=2/5+1/10=4/10+1/10=5/10=1/2

c). (3 1/2-1 2/3)*36/55=(7/2-5/3)*36/55=(21/6-10/6)*36/55=11/6*36/55=6/5

d). 2/3*(1 1/5+2 1/2)-(1/2+1/4+1/3)=2/3*(6/5+5/2)-(6/12+3/12+4/12)=

=2/3*(12/10+25/10)-13/12=2/3*37/10-13/12=1/3*37/5-13/12=37/15-13/12=

=148/60-65/60=83/60