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6.9×1.7+2.3x4.9
=(2.3×3)×1.7+2.3×4.9
=2.3×(3×1.7)+2.3×4.9
=2.3×5.1+2.3×4.9
=2.3×(5.1+4.9)
=2.3×10
=23
=(2.3×3)×1.7+2.3×4.9
=2.3×(3×1.7)+2.3×4.9
=2.3×5.1+2.3×4.9
=2.3×(5.1+4.9)
=2.3×10
=23
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展开全部
6.9×1.7+2.3x4.9
=6.9×1.7+2.3x6.9 -2.3x2
=6.9x(1.7+2.3) -2.3x2
=6.9x4 -2.3x2
=2.3x12 - 2.3x2
=2.3x10
=23
=6.9×1.7+2.3x6.9 -2.3x2
=6.9x(1.7+2.3) -2.3x2
=6.9x4 -2.3x2
=2.3x12 - 2.3x2
=2.3x10
=23
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2018-02-08 · 知道合伙人教育行家
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展开全部
6.9×1.7+2.3x4.9简便计算
=2.3x5.1+2.3x4.9
=2.3x(5.1+4.9)
=2.3x10
=23
=2.3x5.1+2.3x4.9
=2.3x(5.1+4.9)
=2.3x10
=23
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