a, [(-8) + (-7)] + 10 

= (-15) + 10

= -5.

b, (-47).69+31.(-47)

= (-47) . ( 69 + 31 )

= (-47) . 100

= -4700.

a.-5

b.-4700

a)  ( -8) .14 . 225 = - ( 8 .14.225)= -25200

b)  ( -125 ) . (-72 ) = 125.72.7= 9000.7=63000

c)   47.69 - 31 - ( -47 )= 47.(69+31)=4700

mình giải được đến đó thôi

a,-25200

b,63000

c,4700

d,42000

e,-31000

g,1200

c) 47.69-31.(-47)

= 47.(-69)-31.47

=47.(-69-31)=47.-100= -4700

Câu 1 :

a) 1532 + ( - 186 ) + ( - 1432 ) - 14 + 123

= 1532 - 186 - 1432 - 14 + 123

= ( 1532 - 1432 ) - ( 186 + 14 ) + 123

= 100 - 200 + 123

= -100 + 123

= -23.

b) -47.69 + 31.(-47)

= -47 . ( 69 + 31 )

= -47 . 100 = -4700

Câu 2 

a) x + 10 = -14

x = -14-10 = -24

b ) 5x-12=48

5x = 48+12=60

x=60:5=12

Câu 1:

a) 1532 +(-186) +(-1432)-14+123

  =1532+(-1432)+[(-186)-14]+123

  = 100  +  (-200)  +123

  =23

b)-47.69 +31.(-47)

  =-47(69+31)

  = -47.100

  =-4700

Câu 2:

a) x+10=-14

         x=-14-10

         x=-24

b)5x-12=48

        5x=48+12

        5x=60

          x=60:5

          x=12

Tick cho mình nha bạn!

A) (-4.-7).(2.5).(6.25)

=28.10.150

=280.150=42000

B)=3243+(-1457)

=47000

a, 47.69-31(-47)

=47(69+31)

=47.100

4700

b,(-14)(-25)+25(-11)

=14.25+25(-11)

=25(14-11)

=25.3=75

       \(-47.69+31.\left(-47\right)\)

\(=-47\left(69+31\right)\)

\(=-47.100\)

\(=-4700\)

\(25.11.\left(-15\right)-50.15.\left(-5\right)\)

\(=25.11.\left(-15\right)-25.15.2.\left(-5\right)\)

\(=25.\left(-15\right).11-25.\left(-15\right).10\)

\(=25.\left(-15\right).\left(11-10\right)\)

\(=25.\left(-15\right)=-375\)

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