解：原式=66 - 12 + 11.3 - 7.4 + 8.1 -2.5 =66 - 12 + 3.9 + 5.6 =54 + 9.5 =63.5呼...要是我不用空格隔开的话看得你眼都会花...一定要采纳我哦
解原式=66-12+11.3-7.4+8.1-2.5=......
