Toán Lớp 6: a,-9/10.7/11.10/9.(-22)
b,6/7+1/7.2/7+1/7.5/7
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Toán Lớp 6: a,-9/10.7/11.10/9.(-22)
b,6/7+1/7.2/7+1/7.5/7
Comments ( 2 )
Giải đáp:
$a) \dfrac{-9}{10}.\dfrac{7}{11}.\dfrac{10}{9}.(-22)$
$= [(\dfrac{-9}{10}.\dfrac{10}{9}].[\dfrac{7}{11}.(-22)]$
$= (-1).(-14)$
$=14$
$b) \dfrac{6}{7}+\dfrac{1}{7}.\dfrac{2}{7}+dfrac{1}{7}.\dfrac{5}{7}$
$= \dfrac{6}{7}+\dfrac{1}{7}.(\dfrac{2}{7}+\dfrac{5}{7})$
$= \dfrac{6}{7}+\dfrac{1}{7}.1$
$= \dfrac{6}{7}+\dfrac{1}{7}$
$= \dfrac{6+1}{7}$
$=\dfrac{7}{7}$
$=1$
Giải đáp:
#Clickbim
a) -9/10 .7/11 . 10/9.(-22)
=-63/110 . 10/9 . (-22)
= -7/11 .(-22)
= 154/11
= 14
b) 6/7 + 1/7 . 2/7 + 1/7 . 5/7
= 6/7 + 2/49 + 5/49
= 44/49 + 5/49
= 49/49
=1
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