62,5 cm bằng mấy phần của inch
Tính Nhanh
a) 27x(-16)+(-16)x74+16
b)38x(78-59)-78x(38-59)
c) 74x(32+5)-32x(74+5)
d -17x25+34x26-17x49
CÁC BẠN GIÚP MÌNH NHÉ MAI MÌNH NỘP RỒI
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\frac{32^5\cdot81^4}{18^6\cdot16^5}=\frac{4^5\cdot8^5\cdot\left(9^2\right)^4}{2^6\cdot9^6\cdot\left(4^2\right)^5}=\frac{\left(2^2\right)^5\cdot2^5\cdot3^5\cdot\left(3^{2^2}\right)^4}{2^6\cdot\left(3^2\right)^6\cdot\left(2^{2^2}\right)^5}=\frac{2^{10}\cdot2^5\cdot3^5\cdot3^{16}}{2^6\cdot3^{12}\cdot2^{20}}=\frac{2^{15}\cdot3^{21}}{2^{26}\cdot3^{12}}=\frac{3^9}{2^{11}}\)
16 . ( 38 - 2 ) - 38 . ( 16 - 1 )
=16 . 38 - 2 .16 - 38 .16 - 1.38
=16.38.(2.16-1.38)
=608.(32-38)
=608.(-6)
=-3648
a: ĐKXĐ: \(x\notin\left\{4;-4\right\}\)
\(\dfrac{7}{4x+16}=\dfrac{7}{4\left(x+4\right)}=\dfrac{7\left(x-4\right)}{4\left(x+4\right)\left(x-4\right)}\)
\(\dfrac{11}{x^2-16}=\dfrac{11\cdot4}{4\left(x^2-16\right)}=\dfrac{44}{4\left(x-4\right)\left(x+4\right)}\)
b: \(\dfrac{6}{x\left(x+3\right)^2};\dfrac{x-3}{2x\left(x+3\right)^2}\)
ĐKXĐ: \(x\notin\left\{0;-3\right\}\)
\(\dfrac{6}{x\left(x+3\right)^2}=\dfrac{6\cdot2}{2x\left(x+3\right)^2}=\dfrac{12}{2x\left(x+3\right)^2}\)
\(\dfrac{x-3}{2x\left(x+3\right)^2}=\dfrac{x-3}{2x\left(x+3\right)^2}\)
c: \(\dfrac{-6}{1-x};\dfrac{3x}{x^2+x+1};\dfrac{x^2-3x+5}{x^3-1}\)
ĐKXĐ: \(x\ne1\)
\(-\dfrac{6}{1-x}=\dfrac{6}{x-1}=\dfrac{6\left(x^2+x+1\right)}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{6x^2+6x+6}{\left(x-1\right)\left(x^2+x+1\right)}\)
\(\dfrac{3x}{x^2+x+1}=\dfrac{3x\left(x-1\right)}{\left(x-1\right)\left(x^2+x+1\right)}=\dfrac{3x^2-3x}{\left(x-1\right)\left(x^2+x+1\right)}\)
\(\dfrac{x^2-3x+5}{x^3-1}=\dfrac{x^2-3x+5}{\left(x-1\right)\left(x^2+x+1\right)}\)
d: \(\dfrac{17}{5x};\dfrac{24}{x-2y};\dfrac{x-y}{8y^2-2x^2}\)
ĐKXĐ: \(x\ne0;x\ne\pm2y\)
\(\dfrac{17}{5x}=\dfrac{17\cdot2\left(x-2y\right)\left(x+2y\right)}{5x\cdot2\cdot\left(x-2y\right)\left(x+2y\right)}=\dfrac{34\left(x^2-4y^2\right)}{10x\left(x-2y\right)\left(x+2y\right)}\)
\(\dfrac{24}{x-2y}=\dfrac{24\cdot10x\left(x+2y\right)}{10x\left(x-2y\right)\left(x+2y\right)}=\dfrac{240x\left(x+2y\right)}{10x\left(x-2y\right)\left(x+2y\right)}\)
\(\dfrac{x-y}{8y^2-2x^2}=\dfrac{-\left(x-y\right)}{2x^2-8y^2}=\dfrac{-\left(x-y\right)}{2\left(x-2y\right)\left(x+2y\right)}\)
\(=\dfrac{-5x\left(x-y\right)}{10x\left(x-2y\right)\left(x+2y\right)}=\dfrac{-5x^2+5xy}{10x\left(x-2y\right)\left(x+2y\right)}\)
1. 125-125+39+11
=50
2. 39.46+30.(-61)-39.76
=1794 + (-1830) -2964
= -3000
3. -195.56-43.195-195
= -10920 - 8385 - 195
= -19500
mk lm nửa thôi nhé bn vì bh mik có vc bận r
a: \(=4\cdot2\cdot6\cdot25\cdot7\cdot5\)
\(=\left(4\cdot25\right)\cdot\left(2\cdot5\right)\cdot\left(6\cdot7\right)\)
\(=42\cdot100\cdot10=42000\)
b: \(=16\cdot38-16\cdot2-38\cdot16+38\)
\(=-32+38=6\)
a) -4.2.6.25.(-7).5
= (2.5).(-4.25).(-7.6)
= 10.(-100).(-42)
= 42000
b) 16.(38 - 2) - 38.(16 - 1)
= 16.38 - 16.2 - 38.16 - 38
= -38 - 38
= -38.2
= -76.
c) Câu này đề không rõ nha.