99*38+26*39+61*26用简便计算
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99*38+26*39+61*26用简便计算
99*38+26*39+61*26
=(100-1)x38+26x(61+39)
=100x38-38+26x100
=100x(38+26)-38
=6400-38
=6362
=(100-1)x38+26x(61+39)
=100x38-38+26x100
=100x(38+26)-38
=6400-38
=6362