Question

thu gọn các biểu thức sau

a) 7x-19x+6x

b) -ab-ab

Answer 1

a) 7x-19x+6x=  -6x

b) -ab-ab=-ab+(-ab)=-2ab

Answer 2

a) Ta có: 7x - 19x + 6x

= x. ( 7 - 19 + 6 )

= x. ( - 6 )

b) Ta có: -ab - ba

= b. ( -a - a )

= b . [ ( -2 ) .a ]

Answer 3

a.x(7-19+6)

Answer 4

a, 7x-19x+6x

= x(7-19+6)

=x(-6)

=-6x

b,-ab-ab

=-(ab+ab)

=-2ab

CHÚC HOK TỐT!

Answer 5

a) =x(7-19+6)

= x. (-6)

=-6x

b) -ab-ab

= -(ab+ab)

=-2ab