15一5.4+4.6=15+4.6一5.4=19.6一5.4=14.2
=19.6-5.4
=14.2
先算加法再算减法就可以的
如上过程解答题目
15-5.4+4.6=15-(5+0.4)+(5-0.4)=15-5-0.4+5-0.4=15-0.8=14.2
按运算顺序计算就已经很简便了,何必化简为繁! 15-5.4+4.6=9.6+4.6=14.2
15-5.4+4.6=15-(10-4.6)+4.6=15-10+4.6+4.6=5+9.2=14.2