1. 10x (2y – 10 )=

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2. ( x + 5 ) × ( 5x – 1)=
3. (7 – 20x ) × (2x – 7)=
4. (2x – 1) × ( 1 – x )=
5. (xkuatrad 2 + 4x ) × (3x – 7)=

1. 10x (2y – 10 )=

1. 10x (2y-10) = 20xy – 100x
2. (x+5)(5x-1) = 5xkuadrat – x + 25x – 5
                    = 5xkuadrat + 24x – 5
3. (7-20x)(2x-7) = 14x – 49 -  40xkuadrat+ 140x
                       = 154x – 40xkuadrat - 49
4. (2x-1)(1-x) = 2x – 2xkuadrat – 1+ x 
                    = 3x – 2xkuadrat -1
5. maaf, kurang paham sama maksud soalnyaa.