70(100-10x)x%=168怎么算?
问题描述:
70(100-10x)x%=168怎么算?
答
70(100-10x)x%=168
7(10-x)x=168
10x-x²=24
x²-10x+24=0
(x-4)(x-6)=0
x1=4 x2=6