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b) 2 *1-*=*-=-==3
c) (4,5-1,1)*2*3/4-1=3,4*2*3/4-1=6,8*0,75-1=5,1-1=4,1
2,8 * 1,25 - 2/3 *3/4 = 3,5 - 0,5 = 3
(4,5 - 1,1) * 2 * 3/4 - 1 = 3,4 * 2 * - 0,25 = - 1,7
* - razy
(0,2*0,2) - 0,2 do potęgi drugiej
3/4 = 0,75