巧算:78x126+78x24-50x78(列递等式计算)

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巧算:78x126+78x24-50x78(列递等式计算)巧算:78x126+78x24-50x78(列递等式计算)巧算:78x126+78x24-50x78(列递等式计算)78x126+78x24-

巧算:78x126+78x24-50x78(列递等式计算)
巧算:78x126+78x24-50x78(列递等式计算)

巧算:78x126+78x24-50x78(列递等式计算)
78x126+78x24-50x78
=78x(126+24-50)
=78x(150-50)
=78x100
=7800