Question

[Nguyễn Khoa Nguyên]

tính nhanh

a)32.(-64)-64.68 

b) -54.76 + 12.(-76)-76.(-34)

c) 19 - 42.(-19) + 38.5

Answer 1

[Manix]

a ) 32.( - 64 ) - 64.68 

= - 64 x ( 32 + 68 )

= -64 x 100

= -6400

b ) - 54.76 + 12 (.-76) - 76.(-34)

= 76 x ( - 54 + -34 + 12 )

= 76 x (-76 )

= (-5776)

c ) 19 - 42.(-19) + 38 x 5 

= 42 x ( 19 + - 19 ) + 38 x 5

= 42 x 0 + 38 x 5

= 0 + 38 x 5 

= 38 x 5

= 190 

=)

Answer 2

[✓ ℍɠŞ_ŦƦùM $₦G ✓]

a) 32 . ( -64 ) - 64 . 68

= ( 32 + 68 ) . ( - 64 )

= 100 . ( - 64 )

= ( - 6400 )

b) ( - 54 ) . 76 + 12 . ( - 76 ) - 76 . ( - 34 )

= 76 x ( -54 + -34 + 12 )

= 76 x ( - 76 )

= ( - 5776 )

c) 19 - 42 . ( -19 ) + 38 . 5

= 42 . ( 19 + -19 ) + 190

= 42 . 0 + 190

= 0 + 190

= 190