A) 237.(-26)+26.137 =26.(137-237)
=26.(-100)=-2600
B)63.(-25)+25.(-23)=25.(-23)-25.63=25.(-23-63)
=25.(-83)=-2150
98
A) ta có a=8
Vậy (-125).(-13).(-8)=-125.8.13=-1000.13=-13000
B) (-1).(-2).(-3).(-4).(-5).20=-1.2.3.4.5.20 =-2400
99)
A) (-7) .(-13)+8.(-13)=(-7+8).(-13)= -13
B) (-5) (-4- -14 )=(-5).(-4)- (-5).(-14)=-50
