简便计算 9.87*0.1+1/2*98.7+4.9%*987

问题描述:

简便计算 9.87*0.1+1/2*98.7+4.9%*987

9.87*0.1+1/2*98.7+4.9%*987
=9.87*0.1+5*9.87+9.87*4.9
=9.87*(0.1+5+4.9)
=9.87*10
=98.7