Question

请教三道数学题（英文的）

(1) six less than a number is the same as five more than three times the number
(2) four more than twice a number is seventeen
(3) 15 less than the product of a number and 4 is equal to 3 times the sum of 8 and the number

就这三道题 希望可以把题意和解题方法讲明白一点 谢谢！

Answer 1

（1）设此number为x，根据题意有如下方程：3x+5=x-6, x=-5.5
给你解释下第一题题意吧，方程的前部分，即six less than a number，意思是比某数少6，即x-6，等号即is the same as，方程的后部分，即five more than three times the number，即比这个数的3倍还多5，即3x+5。列出方程可解得x。
（2）同上，4+2x=17, x=6.5
（3）同上，(4+x)-15=3(8+x), x=-17.5