|
|
此文章由 管閒事的路人 原创或转贴,不代表本站立场和观点,版权归 oursteps.com.au 和作者 管閒事的路人 所有!转贴必须注明作者、出处和本声明,并保持内容完整
代數解法底層思維完全一樣,只是語言不同。
0.25(4+b) + 0.05b = 3.1
Emma has 4 more red counters, each worth $0.25, totalling $1.00. 代數語言: 0.25 * 4 + 0.25* b + 0.05b = 3.1
The students subtracted this $1.00 from the total amount of $3.10, leaving $2.10. 代數語言: 1 + 0.25* b + 0.05b - 1 = 3.1 - 1
his remaining amount represents the cost of the equal number of red and blue counters 代數語言: 0.25* b + 0.05 b = 2.1
To simplify, the students grouped one red and one blue counter together, forming a “pack” worth $0.30 代數語言: (0.25* + 0.05) b = 2.1 (乘法分配律)
They then calculated that 7 such packs would cost exactly $2.10 代數語言: 0.3 b = 2.1 => b= 7
Therefore, the solution is 7 blue counters.
|
|