3.1×5.3+5.3×6.9怎么简算?

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3.1×5.3+5.3×6.9怎么简算?
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3.1×5.3+5.3×6.9怎么简算?
3.1×5.3+5.3×6.9怎么简算?

3.1×5.3+5.3×6.9怎么简算?
3.1×5.3+5.3×6.9
=5.3×(3.1+6.9)
=5.3×10
=53

5.3×(3.1+6.9)=53

5.3×(3.1+6.9)

6.9加3.1乘5.3

先乘后加

5.3/(3.1+6.9)

5.3×(3.1+6.9)
=5.3×10
=53

()3.1+6.9)*5.3