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b. luas = ab + ab + ab + ab + ab + ab + ab + ab + ab = 9 ab
c. luas = 6s + 3st
2). a. 10 x ( 2y - 10 )
= 20y - 100
b. ( x + 5 ) x ( 5x - 1 )
= 5x² - 1x + 10x - 5
= 5x² - 9x - 5
c. ( 7 - 2x ) x ( 2x - 7 )
= 14x - 49 - 4x - 14
= 14x 53x - 14
3). ( 2x + 3y ) ( pr + qy ) = rx² + 23xy + 12y²
= 2px² + 2xqy + 3pxy + 3qy² = rx² + 2xy + 12y²
= R= 2p
4). a. - 6x - 80xy
= -2 ( 3x + 40xy )
= x ( - 6 - 80 y )
b. y² + 7y + 10
= y ( y + 7y + 10 )
= y² ( 7y + 10 )
5). a. 102 x 98
= 9996
b. 1003 x 97
= 97.291
c. 205²
= 42025
d. 398²
= 158.404
*SEMOGA BERMANFAAT*.............