1、4.4+4.4×12+13×5.6
=4·4×(1+12)+13×5.6
=4·4×13+13×5.6
=13×(4·4+5·6)
=13×10
=130
2、1240×3.8+124×63-12.4×10
=124×38+124×63-124
=124×(38+63-1)
=124×100
=12400
不懂的还可以追问!满意请及时采纳! O(∩_∩)O
1240*3.8+124*63-12.4*10
=124*38+124*63-124*1
=124*(38+63-1)
=124*100
=12400