Question

36×78＋21×78＋57×22，简便用算？

我算来算去不会

Answer 1

36x78+21x78+57×22
=（36+21）x78十57x22
=57x78+57×22
=57x（78+22）
=57x100
=5700

Answer 2

原式＝78×(36＋21)＋57×22
＝78×57＋57×22
＝57×(78＋22)
＝57×100
＝5700

Answer 3

（36+21）*（78+22）=5700

Answer 4

简便算法如下:
原式=(36+21)×78+57×22
=57×78+57×22
=57×(78+22)
=5700

Answer 5

简算：
36X78+21X78+57X22
=78X（36+21）+57X22
=78X57+57X22
=57X（78+22）
=57X100
=5700