Question

3.69*0.99+3.69*0.001的简便运算！急急急急急急急急急急急急急急急急急急急！！今天六点前要！！

*=乘号

Answer 1

3.69*0.99+3.69*0.001
=3.69*(1-0.01)+3.69*0.001
=3.69-0.0369+0.00369
=3.65679

Answer 2

=3.69*(0.99+0.01)
=3.69*1
=3.69

Answer 3

=3.69（0.99+0.001）
=3.69×0.991
=3.65679

Answer 4

3.69*0.99+3.69*0.001=（0.99+0.001）*3.69=1*3.69=3.69