x:8+x*8=64
8 x 8 x8 x 8 x 8 : 64
8 x 8 x 8 x 8 x 8 :64
= 40 : 64 = 0,625
k mik nha
Tính nhẩm
8 x 6 =
8 x7 =
8 x 8 =
8 x 9 =
48 : 8 =
56 : 8 =
64 : 8 =
72 : 8 =
8 x 6 = 48
8 x7 = 56
8 x 8 = 64
8 x 9 = 72
48 : 8 = 6
56 : 8 = 7
64 : 8 = 8
72 : 8 = 9
Tính nhẩm
8 x 2 = ....... 8 x 3 = ....... 8 x 4 = ....... 8 x 5 = .......
16 : 8 = ..... 24 : 8 = ..... 32 : 8 = ..... 40 : 8 = .....
8 x 6 = ....... 8 x 7 = ....... 8 x 8 = ....... 8 x 9 = .......
48 : 8 = ..... 56 : 8 = ..... 64 : 8 = ..... 72 : 8 = .....
8 x 2 = 16 8 x 3 = 24 8 x 4 = 32 8 x 5 = 40
16 : 8 = 2 24 : 8 = 3 32 : 8 = 4 40 : 8 = 5
8 x 6 = 48 8 x 7 = 56 8 x 8 = 64 8 x 9 = 72
48 : 8 = 6 56 : 8 = 7 64 : 8 = 8 72 : 8 = 9
16 24 32 40
2 3 4 5
48 56 64 72
6 7 8 9
x+8+8+8+8+8+8+8=64
tính nhanh
8,64 x 93 + 8,64 : 0,5 + 8, 64 : 0,25 + 8, 64
\(8,64\times93+8,64:0,5+8,64:0,25+8,64\)
\(=8,64\times93+8,64\times2+8,64\times4+8,64\times1\)
\(=8,64\times\left(92+4+2+1\right)\)
\(=8,64\times100\)
\(=864\)
8,64×93+8,64:0,5+8,64:0,25+8,648
=8,64×93+8,64×2+8,64×4+8,64×1
=8,64×(92+4+2+1)
=8,64×100
=864
giúp mh với mh đang cần gấp
hứa mh sẽ tích
|x^8-1|+|x^8-64|=63-X^2+2X
\(\dfrac{1}{27}+a^3\\ 8x^3+27y^3\\ \dfrac{1}{8}x^3+8y^3\\ x^6+1\\ x^9+1\\ x^3-64\\ x^3-125\\ 8x^6-27y^3\\ \dfrac{1}{64}x^6-125y^3\\ \dfrac{1}{8}x^3-8\\ x^3+6x^2+12x+8\\ x^3+9x^2+27x+27\) Giúp mình với mình cần gấp ;-;
1) \(\dfrac{1}{27}+a^3=\left(\dfrac{1}{3}+a\right)\left(\dfrac{1}{9}-\dfrac{a}{3}+a^2\right)\)
2) \(=\left(2x+3y\right)\left(4x^2-6xy+9y^2\right)\)
3) \(=\left(\dfrac{1}{2}x+2y\right)\left(\dfrac{1}{4}x-xy+4y^2\right)\)
4) \(=\left(x^2+1\right)\left(x^4-x^2+1\right)\)
5) \(=\left(x^3+1\right)\left(x^6-x^3+1\right)\)
6) \(=\left(x-4\right)\left(x^2+4x+16\right)\)
7) \(=\left(x-5\right)\left(x^2+5x+25\right)\)
8) \(=\left(2x^2-3y\right)\left(4x^4+6x^2y+9y^2\right)\)
9) \(=\left(\dfrac{1}{4}x^2-5y\right)\left(\dfrac{1}{16}x^4+\dfrac{5}{4}x^2y+25y^2\right)\)
10) \(=\left(\dfrac{1}{2}x-2\right)\left(\dfrac{1}{4}x^2+x+4\right)\)
11) \(=\left(x+2\right)^3\)
12) \(=\left(x+3\right)^3\)
Bài 1: tính nhanh
a)(128+1276+262+324) x (64 - 8 x 8)
b)(64: 8 x 0) x (223+1376+372+624)
M.N LÀM NHANH CHO MÌNH NHÉ!CẢM ƠN!
a) (128+1276+262+324)x(64-8x8)
=(128+262) + (1276+324)x(64-8x8)
=1600+390=1990
a) = (128+276+262+324) x ( 64 - 64)
= (...) x 0
= 0
b)= ( 8 x 0) x ( ....)
= 0 x (....)
=0
mấy chỗ (....) là viết như đề bài nha!
k mk nha!^^
a , ( 1276 + 324 + 128 + 262 ) * ( 64 - 64) = ( 1600 + 390) * 0= 1990 * 0 = 0
Tính nhẩm:
7 x 6 =
63 : 9=
8 x 7 =
64 : 8=
7 ´ 6 = 42
8 ´ 7 = 56
63 : 9 = 7
64 : 8 = 8
tính nhanh
64 : 8 - 32 : 8
72 x 7 + 36 x 86
a.(64 - 32 ) :8 = 32 : 8 = 4
b. 36 x 2 x7 + 36 x 86
= 36 x (14 + 86)
= 36 x 100
= 3600
68:8 - 32 : 8
= ( 68 - 32): 8
= 36 : 8
= 4,5
72 x 7 + 36 x 86
= 72 x 7 + 36 x 2 x 43
= 72 x 7 + 72 x 43
= 72 x ( 7 + 43)
= 72 x 50
= 3600
a) 64 : 8 - 32 : 8
=( 64 - 32 ) : 8
= 32 : 8
= 4
b. 36 x 2 x7 + 36 x 86
= 36 x (14 + 86)
= 36 x 100
= 3600