Question

Tính hợp lí:

(- 48) + 48. ( -78) + 48. ( -21)

(- 12). 47 + ( -12). 52 + ( -12)

Answer 1

(-48) + 48. (-78) + 48. (-21)

= (-48) + (-48). 78 + (-48). 21

= (-48). (1 + 78 + 21)

= (-48) . 100

= -4800

(-12). 47 + (-12). 52 + (-12)

= (-12). (47 + 52 + 1)

= (-12). 100

= -1200

Answer 2

\(\left(-48\right)+48.\left(-78\right)+48.\left(-21\right)\)

\(=48.\left(-1\right)+48.\left(-78\right)+48.\left(-21\right)\)

\(=48.\left(-1-78-21\right)\)

\(=48.\left(-100\right)\)

\(=-4800\)

(- 12). 47 + ( -12). 52 + ( -12)

\(=-12.\left(47+52+1\right)\)

\(=-12.100\)

\(-1200\)

Answer 3

(-48) + 48 . (-78) + 48 . (-21)

= (-48) + (-48) . 78 + (-48) . 21

= (-48) . (78 + 21 + 1)

= (-48) . 100

= -4800

(-12) . 47 + (-12) . 52 + (-12)

= (-12) . (47 + 52 + 1)

= (-12) . 100

= -1200

Answer 4

-48+48.(-78)+48.(-21)= -1.48+48.(-78)+48.(-21)

=48.[(-1)+(-78)+(-21)=48.(-100)= -4800

-12.47+(-12).52+(-12)= -12.(47+52+1)

= -12.100= -12000

Nếu đúng tick cho mình nhé

Answer 5

tự làm