巧算:123×1+246×2+369×5(必须要巧算)

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巧算:123×1+246×2+369×5(必须要巧算)巧算:123×1+246×2+369×5(必须要巧算)巧算:123×1+246×2+369×5(必须要巧算)123×1+246×2+369×5=1

巧算:123×1+246×2+369×5(必须要巧算)
巧算:123×1+246×2+369×5(必须要巧算)

巧算:123×1+246×2+369×5(必须要巧算)
123×1+246×2+369×5
=123×1+(123×2)×2+123×3×5
=123×(1+2×2+3×5)
=123×20
=2460

123*1+123*2**2+123*3*2=2460

123x1+123x4+123x15=123x20=2460