简便运算: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:学生作业学帮网 编辑:学帮网 时间:2024/05/19 08:41:02

简便运算: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