69+ 788- 28ex 93+ 49c=
69+69+186+93+857+967+1094=
tất cả = 3335
với lại đây là toán lớp 2 nha bn hiểu nhầm r
40 . 93 - 69 . 120 / 84 . 312 + 611
Sửa đề: 4^10
\(\dfrac{4^{10}\cdot9^3-6^9\cdot120}{8^4\cdot3^{12}+6^{11}}\)
\(=\dfrac{2^{20}\cdot3^6-2^{12}\cdot3^{10}\cdot5}{2^{12}\cdot3^{12}+2^{11}\cdot3^{11}}\)
\(=\dfrac{2^{12}\cdot3^6\left(2^8-3^4\cdot5\right)}{2^{11}\cdot3^{11}\left(2\cdot3+1\right)}=\dfrac{2}{3^5}\cdot\dfrac{-149}{7}=\dfrac{-298}{3^5\cdot7}\)
46×37+93×46+54×61+69×54
=46x ( 37+93)+54 x (61+69)
= 46 x 130 + 54 x 130
= 130 x ( 46+54)
=130 x 100
=13000
46 x 37 + 93 x 46 + 54 x 61 + 69 x 54
= 46 x ( 37 + 93 ) + 54 x ( 61 + 69 )
= 46 x 120 + 54 x 120
= 120 x ( 46 + 54 )
= 120 x 100
= 12000
\(46.35+93.46+54.61+69.54\)
\(=\left(37+93\right)46+\left(61+69\right)54\)
\(=130.46+130.54\)
\(=130\left(46+54\right)\)
\(=130.100=13000\)
Tìm 1/3 của : 69 kg; 36 m; 93 l
1/3 của 69 kg là : 69 : 3 = 23 (kg)
1/3 của 36 m là : 36 : 3 = 12 (m)
1/3 của 93 l là : 93 : 3 = 31 (l)
Tính nhanh
45×37+93×45+55×61+69×55
`#3107.101107`
\(45\times37+93\times45+55\times61+69\times55\)
\(=45\times\left(37+93\right)+55\times\left(61+69\right)\)
\(=45\times130+55\times130\)
\(=130\times\left(45+55\right)\)
\(=130\times100\)
\(=13000\)
\(#GNamK\)
45x37+93x45+55x61+69x55
=45x(37+93)+55x(61+69)
=45x130+55x130
=130x(45+55)
=130x100=13000
X:2+250*4=55*61+69*55-45*37-93*45
\(x:2+250.4=55.61+69.55-45.37-93.45\)
\(\Leftrightarrow x:2+1000=55\left(61+69\right)-45\left(37+93\right)\)
\(\Leftrightarrow x:2+1000=55.130-45.130\)
\(\Leftrightarrow x:2+1000=130\left(55-45\right)\)
\(\Leftrightarrow x:2+1000=130.10\)
\(\Leftrightarrow x:2+1000=1300\)
\(\Leftrightarrow x:2=1300-1000=300\)
\(\Leftrightarrow x=300.2=600\)
Vậy \(x=600\)
X:2+250*4=55*61+69*55-45*37-93*45
X:2+250*4=(55*61+69*55)-(45*37+93*45)
X:2+1000=55*(61+69)-45*(37+93)
X:2+1000=55*130-45*130
X:2+1000=(55-45)*130
X:2+1000=10*130
X:2+1000=1300
X:2=1300-1000
X:2=300
X=300*2
X=600
Vậy X = 600
Tính hợp lí 92/2 + 93/6 + 87/12+ 79/20+69/30+57/42
Tính hợp lý ( nếu có thể)
43*37+93*43+57*61+69*5
=43.37+93.43+57.61+69.57
=43.(37+93)+57.(61+69)
=43.130+77.130
=130.(43+57)
=13000
Tính tổng
\(\dfrac{51}{53}+\dfrac{55}{57}+\dfrac{61}{63}+\dfrac{69}{71}+\dfrac{79}{81}+\dfrac{91}{93}\)
\(\dfrac{51}{53}+\dfrac{55}{57}+\dfrac{61}{63}+\dfrac{69}{71}+\dfrac{79}{81}+\dfrac{91}{93}\)
\(=\left(\dfrac{52}{53}-\dfrac{1}{53}\right)+\left(\dfrac{56}{57}-\dfrac{1}{57}\right)+\left(\dfrac{62}{63}-\dfrac{1}{63}\right)+\left(\dfrac{70}{71}-\dfrac{1}{71}\right)+\left(\dfrac{80}{81}-\dfrac{1}{81}\right)+\left(\dfrac{92}{93}-\dfrac{1}{93}\right)\)
\(=\left(1-\dfrac{1}{53}-\dfrac{1}{53}\right)+\left(1-\dfrac{1}{57}-\dfrac{1}{57}\right)+\left(1-\dfrac{1}{63}-\dfrac{1}{63}\right)+\left(1-\dfrac{1}{71}-\dfrac{1}{71}\right)+\left(1-\dfrac{1}{81}-\dfrac{1}{81}\right)+\left(1-\dfrac{1}{93}-\dfrac{1}{93}\right)\)
\(=\left(1-0\right)+\left(1-0\right)+\left(1-0\right)+\left(1-0\right)+\left(1-0\right)+\left(1-0\right)\)
\(=1+1+1+1+1+1\)
\(=6\)