38 : [ 100 - ( 2 + 7 )2 ]

giúp mình nha lưu ý cái này là tính nhanh ${}^{}$ ai nhanh thì mình tik 

1. She turned down the radio so that she wouldn’t disturb the neighbors.
A. She turned down the radio in order that disturb the neighbors.
B. She turned down the radio in order not to disturb the neighbors.
C. She turned down the radio so as not to she wouldn’t disturb the neighbors.
D. She turned down the radio so as to she wouldn’t disturb the neighbors.
2. Although he took a taxi, Bill still arrived late for the concert.
A. Bill arrived late for the concert because of the taxi.
B. Bill took a taxi to the concert, but he couldn’t catch it.
C. In spite of taking a taxi, Bill arrived late for the concert.
D. Bill arrived late for the concert whether he took a taxi or not.
3. Because Susan feels sleepy, she can’t focus on the lesson.
A. Because of feeling sleepy, Susan can’t focus on the lesson.
B. As feeling sleepy, Susan can’t focus on the lesson.
C. In order to feeling sleepy, Susan can’t focus on the lesson.
D. Since feeling sleepy, Susan can’t focus on the lesson.

bài 3: tìm x biết: a,3x(x-2)-x+2=0      b, x(x-4)-2x+8=0      c,x^2-25-(x+5)=0     d,(2x-1)^2-(4x^2-1)=0   e,(3x-1)^2-(x+5)^2=0      f,x^3-8-(x-2)(x-12)=0       m,x^2-x-2       n,2x^2-5x+3    o,x^2-4x+3               giúp mình giải với nha

cho tam giác ABC có cạnh a . khi đó |CB-CA| bằng ?

Kháng nguyên là gì ? A.Các phân tử chất rắn có sẵn trong cơ thể.B.Những phân tử ngoại lai có khả năng kích thích cơ thể tiết ra kháng thể.C.Những phân tử prôtêin do cơ thể tiết ra để chống lại các kháng nguyên.D.Cả A và B.