Question

26×39分之14+13×39分之16 简便方法计算 2.8×（7分之1+28分之3） 简便方法计

26×39分之14+13×39分之16
简便方法计算
2.8×（7分之1+28分之3）
简便方法计算

Answer 1

26×39分之14+13×39分之16
=39分之13×28+39分之13×16

=39分之13×（28+16）

=3分之1×44

=3分之44

2.8×（7分之1+28分之3）

=2.8×7分之1+2.8×28分之3

=0.4+0.3

=0.7

Answer 2

=26×14/39+13×14/39+13×2/39
=14/39×（26+13）+13×2/39
=14+26/39
=14+2/3=14又三分之二

追答

=2.8×1/7+2.8×3/28
=28/10×1/7+28/10×3/28
=4/10+3/10=7/10

Answer 3

26×14/39+13×16/39
=13×2×14/39+13×16/39
=13×（2×14/39+16/39）
=13×54/39
=18

追答

算错了

应该是13×44/39=572/39

Answer 4

26*14/39+13*16/39
=14*26/39+8*2*13/36
=14*26/39+8*26/39
=26/39*（14+8）
=26*39*22
=572/39
=44/3

2.8*（1/7+3/28
=28/10*1/7+28/10*3/28
=4/10+3/10
=7/10

Answer 5

13*(28/39+16/39)=44/3
2.8(1/7+3/28)=2.8(7/28)=70

追答

0.7