1+0.45/0.9-7/8（简算的要简算）计算过程是1+0.45÷0.9-7/8

1+0.45/0.9-7/8（简算的要简算）计算过程是1+0.45÷0.9-7/8
1+0.45/0.9-7/8（简算的要简算）计算过程
是1+0.45÷0.9-7/8

1+0.45/0.9-7/8（简算的要简算）计算过程是1+0.45÷0.9-7/8
1+0.45/0.9-7/8
=1+1/2-7/8
=12/8-7/8
=5/8
如果本题有什么不明白可以追问,

1+0.45/0.9-7/8
= 1+0.5-7/8
= 12/8 - 7/8
= 5/8

1+0.45/0.9-7/8
=1+45/90-7/8
=1+1/2-7/8
=3/2-7/8
=12/8-7/8
=5/8

1+0.45/0.9-7/8
=1+1/2-7/8
=1+1/2-(4/8+3/8)
=1+1/2-1/2-3/8
=1-3/8
=5/8
不过，我认为这样反而更麻烦