1.5×[19/21÷61/3×(0.7-0.66)]×4.9.

问题描述:

1.5×[

19
21
÷6
1
3
×(0.7-0.66)]×4.9.

1.5×[

19
21
÷6
1
3
×(0.7-0.66)]×4.9,
=1.5×[
19
21
÷
19
3
÷0.04×4.9,
=1.5×[
19
21
×
3
19
×25]×4.9,
=1.5×
25
7
×4.9,
=26.25.