\(-47.69+31.\left(-47\right)\)
\(=-47\left(69+31\right)\)
\(=-47.100\)
\(=-4700\)
\(25.11.\left(-15\right)-50.15.\left(-5\right)\)
\(=25.11.\left(-15\right)-25.15.2.\left(-5\right)\)
\(=25.\left(-15\right).11-25.\left(-15\right).10\)
\(=25.\left(-15\right).\left(11-10\right)\)
\(=25.\left(-15\right)=-375\)
a, -47.69+31.(-47)
=-47.(69+31)
=-47.100
=-4700
a)
-47.69 + 31.(-47)
= (-47)(69+31)
=(-47).100=-4700
b)
25.11.(-15) - 50.15.(-5)
=25.11.(-15) - 25.2.3.5.(-5)
=25.11.(-15) - 25.10.(-15)
=(-15)(25.11-25.10)
=(-15)[25(11-10)]
=(-15).25=-375
a,-47.69+31.(-47)
=-47.(69+31)
=-47.100
=-4700
b,25.11.(-15)-50.15.(-5)
=25.(-11).15-50.15.(-5)
=15.{[25.(-11)]}-{[50.(-5)]}
=15.{-275 - (-250)}
=15.(-25)
=-375
Ta có :
a , ( - 47 ) × 69 + 31 × ( - 47 )
= ( - 47 ) × ( 69 + 31 )
= ( - 47 ) × 100
= - 4700
b , 25 × 11 × ( - 15 ) - 50 × 15 × ( - 5 )
= [ 25 × 11 × ( - 15 ) ] - [ 50 × 15 × ( - 5 ) ]
= ( - 4125 ) - ( - 3750 )
= - 375
Chúc bạn học giỏi
( -47 ) * 69 + 31 * ( -47 )
= ( -47 ) * ( 69 + 31 )
= ( -47 ) * 100
= -4700
25 * 11 * ( -15 ) - 50 * 15 * ( -5 )
= 25 * 11 * ( -15 ) - 25 * 10 * ( -15 )
= ( -15 ) * [ 25 * ( 11 - 10 )]
= ( -15 ) * ( 25 * 1 )
= ( -15 ) * 25
= -375
