（7.6*15+2.4*5）除以126
=(7.6*15+0.8*15)÷126
=15*(7.6+0.8)÷126
=15*8.4÷126
=15*2/30
=1=15*2/30 算出来不是1啊=15*2/30=30/30=1 怎么不等于？？