3.85+6.42-1.78怎样算简便?
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3.85+6.42-1.78怎样算简便?3.85+6.42-1.78怎样算简便?3.85+6.42-1.78怎样算简便?3.85+6.42-1.78=3.85+6.15+0.27-1.78=10+0.
3.85+6.42-1.78怎样算简便?
3.85+6.42-1.78怎样算简便?
3.85+6.42-1.78怎样算简便?
3.85+6.42-1.78
=3.85+6.15+0.27-1.78
=10+0.27-2+0.22
=8+0.49
=8.49
3.85+6.42-1.78
=3.85-1.78+6.42
=3.07+6.42
=9.49
3.85+6.42-1.78
=3.85-1.78+6.42
=3.07+6.42
=9.49