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

2025-03-21 06:48:28
推荐回答(5个)
回答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

回答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

回答3:

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

回答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

回答5:

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