9.99x2.22+6.66x6.67怎么巧算?
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9.99×2.22+6.66×6.67
=6.66×(3×1.11)+6.66×6.67
=6.66×(3.33×6.67)
=6.66×10
=66.6
=6.66×(3×1.11)+6.66×6.67
=6.66×(3.33×6.67)
=6.66×10
=66.6
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9.99×2.22+6.66×6.67
=9.99×2.22+2.22×3×6.67
【提取2.22】
=2.22×(9.99+20.01)
=2.22×30
=66.6
=9.99×2.22+2.22×3×6.67
【提取2.22】
=2.22×(9.99+20.01)
=2.22×30
=66.6
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=3.33×3×2.22+6.66×6.67
=3.33×6.66+6.66×6.67
=6.66×(3.33+6.67)
=6.66×10
=66.6
=3.33×6.66+6.66×6.67
=6.66×(3.33+6.67)
=6.66×10
=66.6
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原式=3.33×3×2.22+6.66×6.67=3.33×6.66+6.66×6.67=6.66×(3.33+6.67)=6.66×10.00=66.60
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