Trang chủ » Hỏi đáp » Môn Toán a) (-11) .(-28)+(-9).13 b) (-69).(-31) – (-15).12 c) [16-(-5)].(-7) d) [(-4).(-9)-6].[(-1)-(-7)] 14/09/2024 a) (-11) .(-28)+(-9).13 b) (-69).(-31) – (-15).12 c) [16-(-5)].(-7) d) [(-4).(-9)-6].[(-1)-(-7)]
tt(ni n a) (−11)*(−28)+(−9)*13 =308+(−117) =191 b) (−69)*(−31)−(−15)*12 =2139−(−180) =2139+180 =2319 c) [16-(-5)]*(-7) =[16+6]*(-7) =21*(-7) =-147 d) [(-4)*(-9)-6]*[(-1)-(-7)] =[36-6]*[(-1)-(-7)] =30*6 =180 Trả lời
a) ( -11 ) . ( -28 ) + ( -9 ) . 13 = 308 + ( -117) =191 b) ( -69 ) . ( -31 ) – ( -15 ) . 12 =2139 – ( -180) = 2139 + 180 = 2319 c) [16-(-5)] . (-7) = (16+5) . ( -7 ) = 21 . ( -7 ) = -147 d) [(-4).(-9)-6].[(-1)-(-7)] = (36 – 6 ) . [(-1) + 7 ] = 30 . 6 = 180 Trả lời
a)
(−11)*(−28)+(−9)*13
=308+(−117)
=191
b)
(−69)*(−31)−(−15)*12
=2139−(−180)
=2139+180
=2319
c)
[16-(-5)]*(-7)
=[16+6]*(-7)
=21*(-7)
=-147
d)
[(-4)*(-9)-6]*[(-1)-(-7)]
=[36-6]*[(-1)-(-7)]
=30*6
=180