1.60%X+15=40
问题描述：
1.60%X+15=40
2.5/10+(7/10-1/4)除1/2
3.(1/2+1/3+1/4)x12
4.7/20x99+7/20
5.20/3x1/2-1/34
6.15-4.25-5.75
7.0.25厘米
答
速度问题.不打解了.1.60%X+15=4060%x=40-15x=25/60%x=125/32.5/10+(7/10-1/4)除1/2 =1/2+9/20/1/2=1/2+9/10=7/53.(1/2+1/3+1/4)x12 =6+4+3=134.7/20x99+7/20 =7/20x(99+1)=355.20/3x1/2-1/34 =10/3-1/34=337/1.26.15...