Thực hiện phép tính (bằng cách hợp lí nếu có thể). d) 6/7 : ( 3/26 − 3/13 ) + 6/7 : ( 1/10 − 8/5 )
Giải thích
d) 67:(326−313)+67:(110−85)
=67:(326−626)+67:(110−1610)
=67:(−326)+67:(−32)
=67.(−263)+67.(−23)
=67.[(−263)+(−23)]
=67.(−283)=−8
d) 67:(326−313)+67:(110−85)
=67:(326−626)+67:(110−1610)
=67:(−326)+67:(−32)
=67.(−263)+67.(−23)
=67.[(−263)+(−23)]
=67.(−283)=−8