78×99运用乘法运算律计算这道题
78Ã99
=78xï¼100-1ï¼
=7800-78
=7722
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=78xï¼100-1ï¼
=7800-78
=7722
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第1个回答 2016-03-26
78×99
= 78 ×(100-1)
= 78 × 100 - 78 × 1
= 7800 - 78
= 7722
= 78 ×(100-1)
= 78 × 100 - 78 × 1
= 7800 - 78
= 7722