Sagot :
III
1. 225x5 y3 ÷ 15xy
=1275y3÷15xy
=85y3
=255
2. ( 56y3 + 49y2 ) ÷ (-7y) =
=(168y+98y) ÷ (-7y)
=266y2÷ -7y
=-38y2
3. ( 10r2 – 79r + 63 ) ÷ ( r – 7 ) =
=132r2÷ r-7
=−18.85714286 r2
II. Find the product of the following:
II. Find the product of the following:1. 5r5 ( 6r – 3 ) = 25r × 3r = 75r2
2. 6 ( 7n2 + n – 2 ) = (42n2 + 6n - 12)= 36n2
3. ( 4b2 + 7b + 6 )( 8b + 1 ) = (17b2)(9b)= 153b2