5.3*48+ 5.3*14+ 6.2*47
=5.3*(48+ 14)+ 6.2*47
=5.3*62+6.2*47
=5.3*62+62*4.7
=62x(5.3+4.7)
=62x10
=620
希望帮到你 加油
67*3/4+47*5/6 ——67*3/4=(48+20)*3/4-3/4;47*5/6=48*5/6-5/6得到下步:
=48*(3/4+5/6)+20*3/4-(3/4+5/6) ——两步乘法都是先约分简便
=76+15-38/24
=89又5/12
5.3x48+ 5.3x14+ 6.2x47
=5.3x(48+14) + 6.2x47
=5.3x62 + 6.2x47
=62x(5.3+4.7)
=62x10
=620