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a. 2(4)+5
8+5
13
b. 5+5(1/3)+1/3
5+5/3+1/3
5+6/3
5+2
7
c.(12-6)/2
6/2
3
114)
a)2ab-2a²
b) ab-3ab²
c) 2x²y+6xy²-2x³y
d)x²+2x³-x²y²