7.8×4+0.78×30+8×0.3简便计算

Question

7.8×4+0.78×30+8×0.3简便计算

Answer 1

7.8×4+0.78×30+8×0.3简便计算

=7.8x（4+3）+2.4
=7.8x7+2.4
=54.6+2.4
=57