3.Tính bằng hai cách:
a) \(\frac{9}{5}\) : \(\frac{17}{15}\) +\(\frac{8}{5}\) : \(\frac{17}{15}\) = .............................. b) 0.9 : 0.25 + 1.05 : 0.25 =...........................
= ............................. =...........................
\(\frac{9}{5}\) : \(\frac{17}{15}\) +\(\frac{8}{5}\) : \(\frac{17}{15}\) =................................ 0.9 : 0.25 + 1.05 : 0.25= ..........................
=................................ =........................... Ai nhanh mà đúng thì sẽ được tick nhé!
a) C1:
=27/17 + 24/17
=3
C2:
= (9/5 + 8/5) : 17/15
=17/5 : 17/15 =3
b) C1:
=3,6 + 4,2 = 7,8
C2:
=(0,9 + 1,05): 0,25 = 1,95 : 0,25=7,8
a) \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\left(\frac{9}{5}+\frac{8}{5}\right):\frac{17}{15}=\frac{17}{5}:\frac{17}{15}=\frac{17}{5}.\frac{15}{17}=\frac{15}{5}=3\)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{27}{17}+\frac{24}{17}=\frac{51}{17}=3\)
b) 0,9 : 0,25 + 1,05 : 0,25 = ( 0,9 + 1,05 ) : 0,25 = 1,95 : 0,25 = 7,8
0,9 : 0,25 + 1,05 : 0,25 = 3,6 + 4,2 = 7,8
