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1+2+4+8+16+32+64 = 31+96=127
B)1-3+9-27+81-243+729
1-3+9-27+81-243+729=10-30+810-243=820-273=547
C). 32-16+8-4+2-1+0,5-0,25
32-16+8-4+2-1+0,5-0,25=16+4+1+0,25=21,25