39×98 38×3-38的简便运算？

Question

如题所述

Answer 1

39×98+38×3-38的简便运算
运用乘法分配律
39×98+38×3-38
=（38+1）×98+38×3-38
=38×98+1×98+38×3-38
=38×（98+3-1）+98
=38×100+98
=3800+98
=3898
=38×3-38

Answer 2

解:39×98+38×3-38
＝（38+1）×98+38×3-38
＝38×98+98+38×3-38
＝38×（98+3-1）+98
＝38×100+98
=3898

Answer 3

39X98+38X3-38
=（38+1）X98+38X3-38
=38X98+98+38X3-38X1
=38X（98+3-1）+98
=38X100+98
=3800+98
=3898

Answer 4

39×100-39×2=3822
38×(3-1)=76