简便计算:30-8.12-1.88,18*205,250*125*32,13.015-(4.88-2.985),0.75
1个回答

30-8.12-1.88

=30-(8.12+1.88)

=30-2

=28

18*205

=18*(200+5)

=18*200+18*5

=3600+90

=3690

250*125*32

=250*125*(4*8)

=(250*4)*(125*8)

=1000*1000

=1000000

13.015-(4.88-2.985)

=13.015-4.88+2.985

=(13.015+2.985)-4.88

=16-4.88

=11.12

0.75+57.88+2.25+0.12

=(0.75+2.25)+(57.88+0.12)

=3+58

=61