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45-40 = 5
15. ( 4x -3 ) (x + 2 ) jadi jawabannya a = x +2
16. n (b) ⁿ⁽a⁾ = 3 ² = 9
22. 10 + 10 + 22 + 22 = 64
panjang = 22 dan lebarnya 10
23. ( 3x +15 ) + ( 2x + 10 ) = 180
5x + 25 = 180
5x = 180 - 25
5X = 155
X = 155 : 5 = 31
a. 3x + 15 = 3.31 + 15 = 108 °
30. jawabanya 420000
dari 14 /10 x 30000 = 420000