99×78+33×66怎样简便计算

要运用积不变的规律
2024-11-25 23:28:09
推荐回答(5个)
回答1:

你好,
解:原式=33*3*78+33*66
=33(3*78+3*22)
=99(78+22)
=99*100
=9900

回答2:

99×78+33×66=99×78+(33×3)×22=99×78+99×22=99×(78+22)=99×100=9900

回答3:

99×78+33×66
=99×78+33×3×66÷3
=99×78+99×22
=99×(78+22)
=99×100
=9900

回答4:

=33*3*78+33*66=33*234+33*66=33*300=9900

回答5:

99*78+99*22=99*(78+22)=9900