Toán Lớp 6: a) (-17) . 6
b) 8 . (-125)
c) (-12) . (-15)
d) 21 . (-3) + (-21) . 7
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: a) (-17) . 6
b) 8 . (-125)
c) (-12) . (-15)
d) 21 . (-3) + (-21) . 7
Comments ( 2 )
Giải đáp:
$a) (-17).6= -102$
$b) 8.(-125)= -1000$
$c) (-12).(-15)=180$
$d) 21.(-3)+(-21).7= (-63)+(-147)= -210$
Giải đáp:
a)
(-17).6
=-102
b)
8.(-125)
=-1000
c)
(-12).(-15)
=180
d)
21.(-3)+(-21).7
=21.(-3)-21.7
=21.(-3-7)
=21.(-10)
=-210
Áp dụng :
(+).(+)=(+)
(+).(-)=(-)
(-).(-)=(+)