原式=(238-98)+(262-112)
=140+150
=290
用加法交换律比较简便
238-112+262-98的简便算法?
答; 238-112+262-98
=238+262(-112-98)
=238+(262-210)
=238+52
=290
238-98=140然后就是262-112=150 140+150=290
(238-98)+(262-112)
=140+150
=290