Toán Lớp 6: tính nhanh 75.(-2 3/75+7 2/75-5 4/25)
hỗn số là 3 số trong ngăocj
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 6: tính nhanh 75.(-2 3/75+7 2/75-5 4/25)
hỗn số là 3 số trong ngăocj
Comments ( 2 )
75 . (-2 3/75 + 7 2/75 – 5 4/25)
75 . (-51/25 + 527/75 – 129/25)
= 75 . (374/75 – 129/25)
= 75 . (-13)/75
= (75 xx (-13))/75
= -13/1
= -13
$\text{75 × ( -2$\dfrac{3}{75}$ + 7$\dfrac{2}{75}$ – 5$\dfrac{4}{25}$ ) }$
$\text{= 75 × [( -2 + 7 – 5 ) + ( $\dfrac{3}{75}$ + $\dfrac{2}{75}$ – $\dfrac{4}{25}$ ) }$
$\text{= 75 × $\dfrac{-13}{75}$ }$
$\text{= -13 }$