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1/4+1/3-1/2=3/12+4/12-6/12=7/12-6/12=1/12
0,5 * 2/7 - 3/7= 1/2*2/7 - 3/7=2/14 -3/7= 2/14 - 6/14= - 4/14= - 2/7
15(1/2-1/3)+12(1/4+1/8)=(15/2-15/3)+(12/4+12/8)=7,5-5 + 3+1,5=2,5+4,5=7
(1/2)^-2 *3^-1 -15^0=2^2* 1/3- 1=4*1/3 -1=4/3-1=1 1/3-1= 1/3
2.
0,00072=7,2*10^-4
123000=1,23 *10^5
0,00012= 1,2*10^-4
276300=2,763 *10^5
3.