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2.5x12.9-2.5x0.9简便算法？

2025年03月16日 01:31

有4个网友回答

网友（1）：

解：2.5x12.9-2.5x0.9等于（ 30 ）
∵已知需求出2.5x12.9-2.5x0.9等于多少
A × B - A × C = A × （B - C）
∴2.5 x 12.9 - 2.5 x 0.9
= 2.5 × （12.9 - 0.9）
= 2.5 × 12
= （2×10+5）/10 × 12
= 25/10 × 12
= 5/2 × 12
= 30
答：2.5x12.9-2.5x0.9等于30

网友（2）：

2.5x12.9-2.5x0.9简便算法？
2.5x12.9-2.5x0.9
=2.5x(12.9-0.9)
=2.5×12
=2.5×4×3
=10×3
=30

网友（3）：

2.5X12.9-2.5X0.9
=2.5X（12.9-0.9）
=2.5X12
=2.5x4×3
=10x3
=30

网友（4）：

2.5x12.9-2.5x0.9=2.5x(12.9-0.9)=2.5x12=2.5x(10+2)=2.5x10+2.5x2=25+5=30

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