31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3

来源：学生作业帮助网编辑：六六作业网时间：2024/12/20 23:58:55

31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/331又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/331又1/3×41又1/2-11又1/3

31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3
31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3

31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3
31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3
=（31又1/3-11又1/3）×41又1/2-(41又1/2+9.5)×11又1/3
=20×41又1/2-51×11又1/3
=830-578=252谢谢指正.

31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3
=（31又1/3-11又1/3）×41又1/2×2-9.5×11又1/3
=20×41又1/2×2-9.5×11又1/3
=830-107又2/3
=722又1/3