题目−2.5-2.5−2.5,000,222,0.70.70.7,−8-8−8,34\frac{3}{4}43,−0.202002002-0.202002002−0.202002002这777个数中非负数的个数为____.知识点：有理数的乘方（二）章节：数与式 / 有理数
