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(samakan penyebutnya)
4(2a - 5b)/12 + 3(2a - 7b)/12
= 8a - 20b/12 + 6a - 21b/12
= 8a + 6a - 20b - 21b/12
= 14a - 41b/12
5.) 2a + 3b/5 - 2a - 3b/4
(samakan penyebutnya)
4(2a + 3b)/20 - 5(2a - 3b)/20
8a + 12b/20 - (10a - 15b)/20
8a - 10a + 12b + 15b/20
= -2a + 27b/20
10.) difaktorin
= (4a - b)(3a - 2b)/(3a - 2b)(a + b)
coret 3a - 2b
= (4a - b)(a + b)
= 4a² + 3ab - b²