Toán Lớp 6: M=(-5/7+5/7):(-10/3)+(-2/7+6/11):(-10/3)
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Toán Lớp 6: M=(-5/7+5/7):(-10/3)+(-2/7+6/11):(-10/3)
Comments ( 2 )
M = (-5/7 + 5/11) : (-10/3) + (-2/7 + 6/11) : (-10/3)
= (-55/77 + 35/77). (-3)/10 + (-22/77 + 42/77). (-3)/10
= -20/77. (-3)/10 + 20/77. (-3)/10
= (-3)/10. (-20/77 + 20/77)
= (-3)/10. 0
= 0
M = (-5/7 + 5/7) : (-10/3) + (-2/7 + 6/11) : (-10/3)
M = 0 . (frac{-3}{10})+ (-2/7 + 6/11) : (-10/3)
M = 20/77 + (-22/77 + 42/77) : (-10/3)
M = 20/77 : (-10/3)
M = 20/77 . (-3/10)
M = -60/770 = -6/77
Vậy M = -6/77