解:4.32 - (1.26 + 2.34) = (4×100 + 32)/100 - [(1×100 + 26)/100 + (2×100 + 34)/100 ] = 432/100 - (126/100 + 234/100) =432/100 - 126/100 - 234/100 = 72/100 = 18/25 = 0.72
4.32一(1.26十2.34)=4.32-3.6=0.72