15.8*5.8+4.2*4.2+11.6*4.2
问题描述:
15.8*5.8+4.2*4.2+11.6*4.2
答
15.8*5.8+4.2*4.2+11.6*4.2
=15.8*5.8+4.2*(4.2+11.6)
=15.8*5.8+4.2*15.8
=15.8*(5.8+4.2)
=15.8*10
=158