Question

30+32+35+28-32-33的简便算法

Answer 1

30+32+35+28-32-33

=(30+32+35+28)-(32+33)

=(30*4+0+2+5-2)-(30*2+2+3)

=(30*4+5)-(30*2+5)

=30*4+5-30*2-5;

=30*(4-2)+5-5;

=30*2

=60;