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2a> 10(2y-10)=20y - 100
3a? (2x+3y)(px+qy = rx² 23 xy +12y²
2p x² +(3p+2q)xy +3q y² = r x ² +23y+12y²
sesuaikan saja ..... 2p=r
3p+2q=23
3q=12 ---> q=4
3p + 2 q=23 ---> p=23- 2 .4 =15
r=2 p = 2.15 =30
4a>> 102 x 98 = (100+2)(100-2) = 100² - 2² =10 000 - 4 = 9996