=[-(a²)]³
=(-1)³(a²)³
=-a^6
-(b^3)^4 * (-b^5)^2
=-b^12*[-(b^5)]²
=-b^12*(-1)²*(b^5)²
=-b^12*b^10
=-b^22 (负b的22次方)这个...是四年级的....比如： 355+260+140+245=（355+245）+260+140）=500+300=700
253+150+350+247
=(253+247)+(150+350)
=500+500
=1000
125+345+155+175
=(125+175)+(345+155)
=300+500
=800