问个方程:x/19+(770-x)/10=50

问题描述:

问个方程:x/19+(770-x)/10=50

x/19+(770-x)/10=50 x/19+77-x/10=50 x/10-x/19=77-50 (19x-10x)/(10*19)=27 9x=27*10*19 x=570