1.Divide a by 2 and then add the product of 5 and b to the result.(全部是代数式）
2.3 times the sum of x and y is subtracted from the 4th power of x.
3a.2a 乘 3a 除 6a
3b.15x 除 3 除 5x -3
3c.3a乘(a+a）
4a.2p2次方 乘 4q 乘 p
4b.5 乘 t2次方 乘 u2次方 乘 t2次方
4c.6c乘 x3次方 除 x 除 8
1.1/2+5+b
2.X*X*X*X-3(X+Y)
3a.2a times 3a divided by 6a
3b.15X divided by 3 divided by the difference between 5X and 3
3c. 3a times the sum of a and a
4a. 2 times p square times 4q times p
4b. 5 times t square times u square times t square
4c. 6c times X cube divided by X divided by 8.
追加题 陈先生重75公斤，她的妻子比他重3y公斤. 算出这对夫妇的总体重.
75+（75+3y）
第一题刚才理解错了 改过了！
1, a/2+5b
2.x*x*x*x-3(x+y)
3.如果你下面写的都是题号的话
那么就是 2a.3a/6a;
（15x/3）/(5x-3);
3a*(a+a)
4, 2(p*p)*4q*p
5*(t*t)*(u*u)*(t*t)
(6c*(x*x*x)/x)/8