1.76减0.28目录
2.6÷0.28=9.285714285714286
这道题除不尽
2.6÷0.28=9?8
2.6÷0.28≈9.2857
≈9.286
≈9.29
≈9.3
≈9
=1.5*(7.6-1.8 0.28)
=1.5*(5.8 0.28)
=1.5*(6 0.08)
=1.5*6 1.5*0.08
=9 0.12
=9.12
=1.28*6-0.28*8.6
=(1 0.28)*6-0.28*8.6
=6 0.28*6-0.28*8.6
=6 0.28(6-8.6)
=6-0.28*2.6
=6-0.3*2.6 0.02*2.6
=6-0.78 0.052
=5.22 0.052
=5.272