Question

B. Tự luận

I: Đại số:

Bài 1: Thực hiện phép tính

1) 11/24 - 5/41 + 13/24 + 0,5 - 36/41

2) -12 : (3/4 - 5/6)^2

3) 7/23. [(-8/6) - 45/18]

4) \(23\frac{1}{4}.\frac{7}{5}-13\frac{1}{4}:\frac{5}{7}\)

5) (\(1+\frac{2}{3}-\frac{1}{4}\) ) (\(0,8\:-\frac{3}{4}\) )^2

6) 16\(\frac{2}{7}:\left(\frac{-3}{5}\right)+28\frac{2}{7}:\frac{3}{5}\)

7) \((2^2:\frac{4}{3}-\frac{1}{2}\) ) . 6/5 - 17

8) (1/3)^50 .(-9)^25 -2/3:4

9) 3/5: ( -1/15 - 1/6 )+3/5:( -1/3 - 1\(\frac{1}{15}\) )

10) (-6,5).5,7+5,7.(-3,5)

11) 10.√0,01.√16/9+3√49-1/6√4

12) \(\frac{2⁴.2⁶}{\left(2⁵\right)^2}-\frac{2⁵.15^3}{6^3.10^2}\)

Bài 2. Tìm x, biết

1) x/12 - 5/6 = 1/12

2) 2/3 - 1\(\frac{4}{15}x=\frac{-3}{5}\)

3) -2^3 + 0,5x =1,5

Nhiêu đó thôi mik còn thiếu nhiều lắm

Answer 1

Bài 2:

1) \(\frac{x}{12}-\frac{5}{6}=\frac{1}{12}\)

\(\Rightarrow\frac{x}{12}=\frac{1}{12}+\frac{5}{6}\)

\(\Rightarrow\frac{x}{12}=\frac{11}{12}\)

\(\Rightarrow x.12=11.12\)

\(\Rightarrow x.12=132\)

\(\Rightarrow x=132:12\)

\(\Rightarrow x=11\)

Vậy \(x=11.\)

2) \(\frac{2}{3}-1\frac{4}{15}x=\frac{-3}{5}\)

\(\Rightarrow\frac{2}{3}-\frac{19}{15}x=\frac{-3}{5}\)

\(\Rightarrow\frac{19}{15}x=\frac{2}{3}+\frac{3}{5}\)

\(\Rightarrow\frac{19}{15}x=\frac{19}{15}\)

\(\Rightarrow x=\frac{19}{15}:\frac{19}{15}\)

\(\Rightarrow x=1\)

Vậy \(x=1.\)

3) \(\left(-2\right)^3+0,5x=1,5\)

\(\Rightarrow-8+0,5x=1,5\)

\(\Rightarrow0,5x=1,5+8\)

\(\Rightarrow0,5x=9,5\)

\(\Rightarrow x=9,5:0,5\)

\(\Rightarrow x=19\)

Vậy \(x=19.\)

Chúc bạn học tốt!