解方程.x+68="92.5" 1.5x﹣x=2.56(x+1.5)=13.2☆45.6÷x=4.8检验:
1375+450÷18×25
55×(++++)
++++++++
2.009×43+20.09×2.9+200.9×0.28
(2.5×)÷(×1.8)-0.75÷