\(B=\frac{\left(3^2.5^2.7^2\right).\left(3^3.7^2\right)}{\left(3.5.7^2\right)^2}\)
giải cả bài nhé
\(B=\frac{\left(3^2.5^2.7^2\right).\left(3^3.7^2\right)}{\left(3.5.7^2\right)^2}\)
giải cả bài nhé
Ta có :
\(B=\frac{3^2.5^2.7^2.3^3.7^2}{3^2.5^2.7^4}=\frac{3^4.5^2.7^4}{3^2.5^2.7^4}=\frac{3^4}{3^2}=3^2=9\)
Vậy B = 9.
k nha bạn
B=\(\frac{\left(9.25.49\right).\left(9.49\right)}{735^2}\)
B=\(\frac{11025.441}{540225}\)
B=\(\frac{4862025}{540225}\)
B=9
\(\dfrac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{2.5\left(7^2\right)}\)
\(\dfrac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{2.5.\left(7^2\right)}=\dfrac{2^3.\left(5.5^2\right).\left(7.7^3\right)}{2.5.7^2}\)
\(=\dfrac{2^3.5^3.7^4}{2.5.7^2}=\left(2^3:2\right).\left(5^3:5\right).\left(7^4:7^2\right)=2^2.5^2.7^2\)
=\(\left(2.5.7\right)^2=4900\)
(23 . 5 . 7) . (52 . 73) / 2 . 5 (72)
= (8 . 5 . 7) . (25 . 343) / 2 . 5 . 49
= 280 . 8575 / 490
= 2401000 / 490
= 4900
=(8.5.7).(25.343)/10.49
=280.8575/490
=2401000/490
=490
Tính nhanh: \(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
ê! đây là môn toán mà!!
ai thấy đúng cho mk 1 tick nha!
\(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
\(\frac{2^3.5.7.5^2.7^3}{2^2.5^2.7^4}=\frac{2^3.5^3.7^4}{2^2.5^2.7^4}=2.5=10\)
đối với lớp 6 thì trình bày thế này dễ hiểu hơn
\(\frac{\left(2^3.5.7\right)\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}=\frac{2^3.5.5^2.7.7^3}{2.5.7^2.2.5.7^2}=\frac{2^3.5^3.7^4}{2^2.5^2.7^4}=\frac{2.5}{1}=10\)
\(\dfrac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
\(\dfrac{2^3.5.7(5^2.7^3)}{(2.5.7^2)^2}\)
= \(\dfrac{2^3.5^3.7^4}{2^2.5^2.7^4}\)
= 2.5
= 10
Tính nhanh:a) \(\left(\frac{67}{111}+\frac{2}{33}-\frac{15}{117}\right).\left(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\right)\)
b)\(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
Rút gọn phân số:
a)\(\frac{2.\left(-13\right).9.10}{\left(-3\right).4.\left(-5\right).26}\)
b)\(\frac{2^3.3^4}{2^2.3^2.5};\frac{2^4.5^2.11^2.7}{2^3.5^3.7^2.11}\)
c)\(\frac{121.75.130.169}{39.60.11.198}\)
d)\(\frac{1998.1990+3978}{1992.1991-3984}\)
\(a.\frac{2\cdot\left(-13\right)\cdot9\cdot10}{\left(-3\right)\cdot4\cdot\left(-5\right)\cdot26}\)
\(=\frac{2\cdot\left(-13\right)\cdot3\cdot3\cdot2\cdot5}{\left(-3\right)\cdot2\cdot2\cdot\left(-5\right)\cdot13\cdot2}\)
\(=-\frac{3}{2}\)
b) \(\frac{2^3\cdot3^4}{2^2\cdot3^2\cdot5}=\frac{2\cdot3^2}{5}=\frac{2\cdot9}{5}=\frac{18}{5}\)
\(\frac{2^4\cdot5^2\cdot11^2\cdot7}{2^3\cdot5^3\cdot7^2\cdot11}=\frac{2\cdot1\cdot11\cdot1}{1\cdot5\cdot7\cdot1}=\frac{22}{35}\)
c) \(\frac{121\cdot75\cdot130\cdot169}{39\cdot60\cdot11\cdot198}=\frac{11\cdot11\cdot13\cdot10\cdot169}{13\cdot3\cdot6\cdot10\cdot11\cdot11\cdot6\cdot3}\)
\(=\frac{169}{3\cdot6\cdot6\cdot3}=\frac{169}{324}\)
d) \(\frac{1998\cdot1990+3978}{1992\cdot1991-3984}\)
Tớ thách các cậu tính nhanh được các bài trên
a)\(\frac{2}{3}+\frac{1}{3}.\left(\frac{-2}{5}\right)\)
b)\(\frac{\left(2^3.5.7\right)\left(5^2.7^3\right)}{2^2.5^2.7^5}\)
c)\(\frac{16}{5}:\frac{16}{64}-\left(\frac{4}{5}+\frac{2}{3}\right):\frac{11}{3}\)
d)\(\frac{6}{7}+\frac{5}{7}:5-\frac{8}{9}\)
e)\(\frac{108}{23}.\frac{107}{211}+\frac{108}{23}:\frac{211}{104}\)
f)\(\left(2+\frac{1}{3}+\frac{7}{2}\right):\left(\frac{-25}{6}+3+\frac{1}{7}\right)+\frac{15}{2}\)
Chúc các cậu thành công.
Bài 2: Mỗi xe ô tô có 4 bánh xe . Hỏi 5 xe ô tô như thế có bao nhiêu bánh xe ?
Bài giải
5 xe ô tô như thế có số bánh xe là :
4 x 5= 20 (bánh xe )
Đáp số : 20 bánh xe
Tính
a) \(\frac{\left(2^3.5.7\right).\left(5^2.7^3\right)}{\left(2.5.7^2\right)^2}\)
b) \(1,7.2,3+1,7.\left(-3,7\right)-1,7.3-0,17:0,1\)
=1,7.2,3+1,7.(-3,7)-1,7.3-1,7
=1,7.[2,3+(-3,7)-3-1]
=1,7.(-5,4)
= -9,18
a, \(\frac{\left(2^3\cdot5\cdot7\right)\cdot\left(5^2\cdot7^3\right)}{\left(2\cdot5\cdot7^2\right)^2}=\frac{2\cdot2^2\cdot5^2.5.7.7^2}{2\cdot5\cdot7^2}=\frac{1\cdot2^2\cdot5^2\cdot7^2}{1\cdot1\cdot1}=4900\)
b, \(1,7\cdot2,3+1,7\cdot\left(-3,7\right)-1,7.3-1,7:0,1=1,7\cdot\left(-3,7+2,3-3\right)-1,7:0,1=1,7.\left(-4,4\right)-1,7:0,1=\left(-2,7\right)-17=-19,7\)