\(B=\dfrac{-5}{3}\left(16+\dfrac{2}{7}-28-\dfrac{2}{7}\right)=-12\cdot\dfrac{-5}{3}=20\)
\(B=\dfrac{-5}{3}\left(16+\dfrac{2}{7}-28-\dfrac{2}{7}\right)=-12\cdot\dfrac{-5}{3}=20\)
Bài 1: Thực hiện phép tính:
a,\(\left(\frac{-3}{4}+\frac{2}{7}\right):\frac{2}{7}+\left(\frac{-1}{4}+\frac{5}{7}\right):\frac{2}{3}\)
b,\(\left(-\frac{1}{3}\right)^2\cdot\frac{4}{11}+\frac{7}{11}\cdot\left(-\frac{1}{3}\right)^2\)
c, \(\left(-\frac{1}{7}\right)^0-2\frac{4}{9}\cdot\left(\frac{2}{3}\right)^2\)
d,\(\frac{2^7\cdot9^2}{3^3\cdot2^5}\)
e,\(\left(\frac{1}{3}-\frac{5}{6}\right)^2+\frac{5}{6}:2\)
f,\(\left(9\frac{2}{4}:5,2+3.4\cdot2\frac{7}{34}\right):\left(-1\frac{9}{16}\right)\)
g,\(\sqrt{25}-3\sqrt{\frac{4}{9}}\)
h,\(\left(-2\right)^2+\sqrt{36}-\sqrt{9}+\sqrt{25}\)
i,\(\left(-\frac{1}{2}\right)^4+\left|-\frac{2}{3}\right|-2007^0\)
k,\(\left(-2\right)^3+\frac{1}{2}:\frac{1}{8}-\sqrt{25}+\left|-64\right|\)
m,\(\left(-3\right)^2\cdot\frac{1}{3}-\sqrt{49}+\left(-5\right)^3:\sqrt{25}\)
n,\(\frac{\sqrt{3^2+\sqrt{39^2}}}{\sqrt{91^2}-\sqrt{\left(-7\right)^2}}\)
i)\(\frac{25^9}{5^{16}}-5^3\div5\)
k)\(\frac{5}{7}-\left|\frac{2}{-7}\right|\)
l)\(\frac{3^6\times3^4}{9^3}\)
m)\(\frac{19}{42}+2019+1\frac{5}{27}+\frac{23}{42}-\frac{5}{27}\)
\(3\frac{2}{7}.12\frac{1}{2}-3\frac{2}{7}.5\frac{1}{2}\)
\(\left(\frac{4}{5}\right)^2-\left|-\frac{3}{5}\right|-\sqrt{\frac{25}{100}}\)
\(\frac{9^{15}.27^2}{3^{15}}\)
Giúp mình với các bạn hiền ơi!!!
dang 2
1/_6,4x+(-2,4)x=1,2
2/_2.3/4:x3.1/7:0,01
3/_3/4+1/4:x=1
4/_(x-2/3)(x+1/4)=0
5/_|x+4/5|=0
6/_|x+3/4|-3/4=0
7/_1,6-|x-0,4|=0.5
8/_(x-1/2)^2+=0
9/_(x-3)^3=8
10/_(x+1/2)^2=1/25
11/_-3^x/81=-27
12/_a/x/15=-60/x
b/x/27=2/36
thực hiện phép tính
a, \(\dfrac{5}{6}+\left(\dfrac{-1}{2}\right)+\dfrac{3}{4}\)
b,\(\left(0,75-\dfrac{1}{3}\right):\dfrac{7}{15}\)
c,\(\dfrac{7}{12}-\dfrac{3}{4}.\dfrac{5}{6}\)
d,\(\left(2\dfrac{1}{3}+1\dfrac{3}{4}\right).\dfrac{12}{13}\)
Giúp mk với
Thực hiện phép tính nhanh
a/\(\dfrac{3}{4}+\dfrac{1}{4}:\dfrac{-2}{3}-\left(-5\right)\)
b/\(12.\left(\dfrac{2}{3}-\dfrac{5}{6^{ }}\right)^2\)
c/\(3-6.\left(\dfrac{-6}{7}\right)^0+\left(\dfrac{1}{2}\right)^2:2\)
1. Cho a, b, c là các số thực tm
a/3 = b/5 = c/7 và a-2b+3c=14
Cmr 32a + 10b2 - c3 = 33
Chọn câu trả lời đúng. Cho bốn số a; b; c; d .Biết rằng a : b = 2: 3 ; b : c = 4 : 5 ; c : d = 6 : 7. Thế thì a : b : c : d bằng:
Tìm x,y,z biết x/y=2/3 ; y/z=5/7 và x+y+z=46Help mình cần gấp !!!!