Tính:
A=\(\left(1-\frac{2}{3}+\frac{4}{3}\right)-\left(\frac{4}{5}-1\right)+\left(\frac{7}{5}+2\right)\)
B=\(\left(-3+\frac{3}{4}-\frac{1}{3}\right):\left(5+\frac{2}{5}-\frac{2}{3}\right)\)
C=\(\left(\frac{3}{5}-\frac{4}{15}\right).\left(\frac{2}{7}-\frac{3}{14}\right)-\left(\frac{5}{9}-\frac{7}{27}\right)\)\(.\left(1-\frac{3}{5}\right)+\left(1-\frac{11}{12}\right).\left(1+\frac{11}{12}\right)\)
D=\(\frac{\left(\frac{3}{10}-\frac{4}{15}-\frac{7}{20}\right).\frac{-5}{19}}{\left(\frac{1}{14}+\frac{1}{7}-\frac{-3}{35}\right).\frac{4}{3}}\)
Bài 2 :
a, \(\frac{3}{\left(x+2\right)\left(x+5\right)}+\frac{5}{\left(x+5\right)\left(x+10\right)}+\frac{7}{\left(x+10\right)\left(x+17\right)}=\frac{x}{\left(x+2\right)\left(x+17\right)}\)
b, \(\frac{2}{\left(x-1\right)\left(x-3\right)}+\frac{5}{\left(x-3\right)\left(x-8\right)}+\frac{12}{\left(x-8\right)\left(x-20\right)}-\frac{1}{\left(x-20\right)}=\frac{-3}{4}\)
Tối giản phân số sau bằng cách thuận tiện:
\(\frac{\left(2^4+2^2+1\right)\left(4^4+4^2+1\right)\left(6^4+6^2+1\right)\left(8^4+8^2+1\right)\left(10^4+10^2+1\right)}{\left(3^4+3^2+1\right)\left(5^4+5^2+1\right)\left(7^4+7^2+1\right)\left(9^4+9^2+1\right)\left(11^4+11^2+1\right)}\)
1)\(4\left(x-5\right)-3\left(x+7\right)=-19\)
2)\(7\left(x-3\right)-5\left(3-x\right)=11x-5\)
3)\(4\left(2-x\right)+4\left(x-3\right)=14\)
4)\(-5\left(2-x\right)+4\left(x-3\right)=10x-15\)
5)\(7\left(x-9\right)-5\left(6-x\right)=-5+11x\)
6)\(-7\left(3x-5\right)+2\left(7x-14\right)=28\)
7)\(4\left(x-5\right)-3\left(x+7\right)=5.\left(-4\right)\)
A) \(\frac{3}{\left(X+2\right)\left(X+5\right)}\)+\(\frac{5}{\left(X+5\right)\left(X+7\right)}+\frac{7}{\left(X+10\right)\left(X+17\right)}=\frac{X}{\left(X+2\right)\left(X+17\right)}\)
B) \(\frac{2}{\left(X-1\right)\left(X-3\right)}+\frac{5}{\left(X-3\right)\left(x-8\right)}+\frac{12}{\left(X-8\right)\left(X-20\right)}-\frac{-1}{X-20}=\frac{3}{4}\)
\(C=\left(\frac{3}{5}-\frac{4}{15}\right).\left(\frac{2}{7}-\frac{3}{14}\right)-\left(\frac{5}{9}-\frac{7}{27}\right).\left(1-\frac{3}{5}\right)+\left(1-\frac{11}{12}\right).\left(1+\frac{1}{12}\right)\)
Giải nhanh giùm mình nha các bạn
\(a.2\left(x-5\right)-3\left(x+7\right)=14\)
\(b.5\left(x-6\right)-2\left(x+3\right)=12\)
\(c.3\left(x-4\right)-\left(8-x\right)=12\)
\(d.-7\left(3x-5\right)+2\left(7x-14\right)=28\)
\(e.5\left(3-2x\right)+5\left(x-4\right)=6-4x\)
\(f.-5\left(2-x\right)+4\left(x-3\right)=10x-15\)
\(g.2\left(4x-8\right)-7\left(3+x\right)=|-4|\left(3-2\right)\)
\(h.8\left(x-|-7|\right)-6\left(x-2\right)=|-8|.6-50\)
cứ từ từ mà giải cũng đc
tìm x thuộc Z
a) \(4\left(x-5\right)-7\left(5-x\right)+10\left(5-x\right)=-3\)
b) \(4\left|x-7\right|-3.\left(-5\right)=-2\left|x-7\right|-10\)
Tìm x thuộc N
\(a,\left(x-9\right)^4=\left(x-9\right)^7\)
\(b,\left(3x-15\right)^{10}=\left(3x-15\right)^{15}\)
\(c,\left(x-8\right)^3=\left(x-8\right)^6\)
câu nò đúng mik sẽ cho 5 tick nhé