a) 7*5^2 - 6*4^2
b)16*24+76*16+(-1600)
Thực hiện phép tính :
a) 13 . 3^3 + 17 . 3^3
b) 76 - [ 26 + ( 16 - 2 . 7 ) ^3 ]
c) 3^2 . 7 - ( 1^10 + 24 ) : 5^2
d) 6 . 3^2 - 16 : 2^2
e) 4^2 . 17 - 4^2 . 11
h) 100 - [ 116 - ( 13 - 5 ) ^2 ]
g) 5^3 + ( 3^4 + 4 ) : 2 + ( 27 - 3 ) : 4
--- Giải nhanh hộ '-' Cảm ơn. ---
a) 4.(13 - 16) - (3-5) .(-3)2
b) -2/5+ 7/11+ -11/10 + 7/-11
c) 1/2+2/3+1/6+-2/5
d) 34 .4-66/ 35.5+10.34
a) Ta có: \(4\cdot\left(13-16\right)-\left(3-5\right)\cdot\left(-3\right)^2\)
\(=4\cdot13-4\cdot16+2\cdot9\)
\(=52-64+18\)
=6
b) Ta có: \(-\dfrac{2}{5}+\dfrac{7}{11}+\dfrac{-11}{10}+\dfrac{7}{-11}\)
\(=-\left(\dfrac{2}{5}+\dfrac{11}{10}\right)+\left(\dfrac{7}{11}-\dfrac{7}{11}\right)\)
\(=-\left(\dfrac{4}{10}+\dfrac{11}{10}\right)\)
\(=\dfrac{-15}{10}=\dfrac{-3}{2}\)
a) 10.(x-7)-8.(x+5)=6.(-5)+2b)
b) 12.(x-4)+6.(x-2)-16.(x+3)=7.|-4|
cho mình xin lỗi 2b chuyển thành 24 nhé !!!
1) 168 - ( 18 - 2x ) x 12 = 120
2) [ 75 + ( 16 - x ) ] x 2 = 156
3) 124 - 24 x ( 3x - 16 ) = 76
4) [ ( 10 - x ) x 2 + 5 ] : 3 - 2 = 3
5) [ 80 + ( 62 - x ) ] : 17 - 7 = 1
6) 65 - ( 5x - 70 ) : 2 = 50
7) 504 : 9 136 - 2x ) + 4 = 32
8) ( 13x - 28 ) x 15 - 5 x 23 = 320
Mình cần gấp ạ !!!
A. BÀI TẬP.
I. Số nguyên:
Bài 1: Thực hiện phép tính:
a/ (–4).(+125).( –25).( –8).( –6) b/ 65 – 5 ( 13 + 7)
c/ 24. ( 16 – 5) – 16. ( 24 – 5) d/ 18 . 35 – 7. 5 . 8
e/ 31 . (– 18) – 31. ( – 81) – 31
Bài 2: Tìm x, biết:
a/ 3x – 5 = - 7 + 65 b/ –12 + 3(–x + 7) = – 18
c/ 24: (3x – 2) = – 3
Tính :
2/5 + 11/15 =
7/8 - 7/9 =
11/13 x 26/31 =
16/24 : 4 =
30 : 6/5 =
9/16 : 4 =
1/2 : 1/3 x 8/15 =
\(\dfrac{2}{5}+\dfrac{11}{15}=\dfrac{6}{15}+\dfrac{11}{15}=\dfrac{17}{15}\)
\(\dfrac{7}{8}-\dfrac{7}{9}=\dfrac{63}{72}-\dfrac{56}{72}=\dfrac{7}{72}\)
\(\dfrac{11}{13}\times\dfrac{26}{31}=\dfrac{22}{31}\)
\(\dfrac{16}{24}:4=\dfrac{16}{24}\times\dfrac{1}{4}=\dfrac{4}{24}=\dfrac{1}{6}\)
\(30:\dfrac{6}{5}=30\times\dfrac{5}{6}=25\)
\(\dfrac{9}{16}:4=\dfrac{9}{16}\times\dfrac{1}{4}=\dfrac{9}{64}\)
\(\dfrac{1}{2}:\dfrac{1}{3}\times\dfrac{8}{15}=\dfrac{1}{2}\times3\times\dfrac{8}{15}=\dfrac{4}{5}\)
2/5 + 11/15 = 17/15
7/8 - 7/9 = 7/72
11/13 x 26/31 = 22/31
16/24 : 4 = 1/6
30 : 6/5 = 25
9/16 : 4 = 9/64
1/2 : 1/3 x 8/15 = 3/2 x 8/15 = 4/5
Sắp xếp các phân số sau theo thứ tự
a/ Tăng dần: -5/6; 7/8; 7/24; 16/17; -3/4; 2/3
b/ Giảm dần: -5/8; 7/10; -16/19; 20/23; 214/315; 205/107
a)\(\dfrac{-5}{6};\dfrac{-3}{4};\dfrac{7}{24};\dfrac{2}{3};\dfrac{7}{8};\dfrac{16}{17}\)
b)\(\dfrac{20}{23};\dfrac{205}{107};\dfrac{214}{315};\dfrac{7}{10};\dfrac{-5}{8};\dfrac{-16}{19}\)
Tính:
a) 2 × 9 + 63=…
b) 24 : 4 + 44 =…
c) 5 × 6 − 12 =…
d) 3 × 7 −16=…
a) 2 × 9 + 63 = 18 + 63 = 81
b) 24 : 4 + 44 = 6 + 44 = 50
c) 5 × 6 – 12 = 30 – 12 = 18
d) 3 × 7 – 16 = 21 – 16 = 5
a. \(\frac{x+109}{3}+\frac{x+125}{5}+\frac{x+149}{7}+\frac{x+181}{9}=24\)24
b. \(\frac{x-96}{2}+\frac{x-88}{4}+\frac{x-76}{6}+\frac{x-60}{8}=14\)
c. \(\frac{155x-24}{51}+\frac{185x-48}{57}+\frac{205x-3}{61}\)= 16