Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a: \(\left(-34\right)\cdot11\)
\(=-34\left(10+1\right)\)
\(=-34\cdot10-34\cdot1=-340-34=-374\)
b: \(250\cdot\left(-21\right)\)
\(=-250\left(20+1\right)\)
\(=-250\cdot20-250\cdot1=-5000-250=-5250\)
c: \(\left(-23\right)\cdot101\)
\(=\left(-23\right)\left(100+1\right)\)
\(=-23\cdot100-23\cdot1=-2300-23=-2323\)
d: \(31\cdot\left(-99\right)=-31\cdot99\)
\(=-31\left(100-1\right)\)
\(=-31\cdot100+31\cdot1\)
=-3100+31
=-3069
a) ( − 25 ) .11 = ( − 25 ) . ( 10 + 1 ) = − 25.10 + ( − 25 ) .1 = − 250 + ( − 25 ) = − 275
b) 31. ( − 99 ) = 31. ( − 100 + 1 ) = 31. ( − 100 ) + 31.1 = − 3100 + 31 = − 3069
c) ( − 8 ) .130 = ( − 8 ) . ( 125 + 5 ) = ( − 8 ) .125 + ( − 8 ) .5 = − 1000 + ( − 40 ) = − 1040
d) 25. ( − 14 ) = 25. ( − 10 ) + ( − 4 ) = 25. ( − 10 ) + 25. ( − 4 ) = − 250 + ( − 100 ) = − 350
31. ( − 99 ) = 31. ( − 100 + 1 ) = 31. ( − 100 ) + 31.1 = − 3100 + 31 = − 3069
