Bai 25:Tính bằng cách thuận tiện nhất: a) 5,68times 3,07+307times 4,32times 0,01 b) 127,15times 3+127,15times 9-127,15-127,15 c) 25,6times 2,3+4,6+72,4times 2,3 __

a) $5,68\times 3,07+307\times 4,32\times 0,01 = 17,3776 + 12,8352 = 30,2128$<br />b) $127,15\times 3+127,15\times 9-127,15-127,15 = 381,45 + 1143,35 - 127,15 - 127,15 = 2350$<br />c) $25,6\times 2,3+4,6+72,4\times 2,3 = 58,88 + 4,6 + 167,12 = 230,6$