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b) o 2%wieksza od 1600
1600+2%*1600=1600+0,02*1600=1600+32=1632
c)25% liczby 50
25%*50=0,25*50=12,5
d)(4-3√2)²=14-24√2+9*2=14+18-24√2=32-24√2
e)(9√6-2√10)(9√6 +2√10)=81*6-4*10=486-40=446