17/25*7+7/25*8的简便运算还有99.9*222+33.3*334的简便运算

17/25*7+7/25*8的简便运算还有99.9*222+33.3*334的简便运算
17/25*7+7/25*8的简便运算
还有99.9*222+33.3*334的简便运算

17/25*7+7/25*8的简便运算还有99.9*222+33.3*334的简便运算

  99.9×222+33.3×334
=33.3×666+33.3×334
=33.3×（666+334）
=33.3×1000
=33300

您好：

17/25*7+7/25*8
=7/25x17+7/25x8
=7/25x(17+8)
=7/25x25
=7

99.9*222+33.3*334
=33.3x3x222+33.3x334
=33.3x(666+334)
=33.3x1000
=33300

不明白，可以追问
如有帮助，记得采纳，谢谢
祝学习进步！

17/25*7+7/25*8
=（17+8）/25×7
=7

17/25*7+7/25*8
=7*(17/25+1/25*8)
=7*(17/25+8/25)
=7*[(17+8)/25]
=7*25/25
=7

99.9*222+33.3*334
=33.3*3*222+33.3*334
=33.3*(3*222+334)
=33.3*(666+334)
=33.3*1000
=33300

用乘法 分配律和结合律 即可