1.Half a number squared decreased by four to forth is thirty

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1.Half a number squared decreased by four to forth is thirty-three.
2.Five times a number increased by five is seventy-five.
3.A number to its square root times double the reciprocal of the number is one forth.
如何用数学式子表达以上题目?（中文翻译也行)

把一个数减掉一半后再平方再减4的4次方得33
把一个数乘以5 再加5 得到75
一个数开根号再乘以它的倒数的两倍得到1/4

1.Half a number squared decreased by four to forth is thirty 是不是a is decreased by b 是b减a A decreased by b 就是a A is decreased by b 是a减b 为什么? if 5/4 of x is 20,what number is x decreased by This is my _____time to come here.A.fourth B.four C.forth D. A number decreased by the difference between eight and the n sat a is decreased by b 是 a-b还是b-a啊一道sat考题,if half of a number is equal to 4 more than twice th Today is my brother's birthday.He's_____.A.four B.forth C.fo 1.Which is the smallset number of the four?.A.Two-thirds B.A 英语翻译This Document is signed as a free act by setting forth m Thirty m____ is half an hour