Question

去括号 (5a+b)+6a 5-(7-6m) (2x-7)-(4x-5) (3a方-3a-1)-(5a方+6a-8) (

Answer 1

(5a+b)+6a

=5a+b+6a

=11a+b

5-(7-6m)

=5-7+6m

=6m-2

(2x-7)-(4x-5)

=2x-7-4x+5

=-2x-2

(3a²-3a-1)-(5a²+6a-8)

=3a²-3a-1-5a²-6a+8

=-2a²-9a+7

(8mm-3m²)-5mm-2(3mn-2m²)

=8mm-3m²-5mm-6mn+4m²

=m²-3mm

3y²-x²+(x²-y)-(x²+3y²)

=3y²-x²+x²-y-x²-3y²

=-y-x²

=2-1

=1