31又1/3×41又1/2-11又1/3×41又1/2×2-9.5×11又1/3
网友回答
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.
======以下答案可供参考======
供参考答案1:
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