5 x 2 + 5 x9 =?
Tính bằng hai cách :
( 5/4 + 2/5 ) : 5/6 =
3/4 x 2/5 - 3/4 x 2/7 =
2/3 : ( 5/6 x9/10 ) =
c1 :(5/4 + 2/5) : 5/6 = 33/20 : 5/6 = 99/50
c2 :(5/4 + 2/5) : 5/6 = 5/4 : 5/6 + 2/5 : 5/6 =99/50
c1 : 3/4 x 2/5 - 3/4 x 2/7 = 3/4 x (2/5 - 2/7) = 3/4 x 4/35 = 3/35
c2 : 3/4 x 2/5 - 3/4 x 2/7 = 3/35
c1 : 2/3 : (5/6 x 9/10) = 2/3 : 3/4 = 8/9
c2 : 2/3 : (5/6 x 9/10) = 5/6 : 2/3 x 9/10 : 2/3 = 27/16 * cái này chx chắc:"> quên mất cách lm;-;"" "
Tính:
a,(1-1/5)x(1-2/5)x(1-3/5)x.....x(1-9/5)
b,1/2x2/3x3/4x4/5x.....x9/10
a)
\(\left(1-\dfrac{1}{5}\right)x\left(1-\dfrac{2}{5}\right)x...x\left(1-\dfrac{9}{5}\right)\\ =\left(1-\dfrac{1}{5}\right)x...x\left(1-\dfrac{5}{5}\right)x...x\left(1-\dfrac{9}{5}\right)\\ =\left(1-\dfrac{1}{5}\right)x...x0x...x\left(1-\dfrac{9}{5}\right)=0\)
x là nhân nhé :))
b)
\(\dfrac{1}{2}x\dfrac{2}{3}x...x\dfrac{9}{10}\\ =\dfrac{1x2x...x9}{2x3x...x10}=\dfrac{2x3x...x9}{2x3x...x9x10}=\dfrac{1}{10}\)
2 mũ 5 x 6³ /8²x9²
2^5 x 6^3/ 8^2x 9^2
= 32x 216/ 64x 81
= 6192/ 5184
= 43/36= 1.19 (4)
32 x 216 : 64 x 81
= 6912 : 64 x 81
= 108 x 81
= 8748
Q(x)=x9-1/3x2y^4+9y^5-x9-8x^4y^3+2016
Thời gian tào hỏa đi là:
20 - 4 = 16(phút)
Quãng đường AB là:
120 x 16 = 1920(km)
Đáp số: 1920 km
tìm x
-2/3-1/3(2x-5)=3/2
x-2/182=(-6/14)x35/91
x:(7/2-31/6)=21/5-20/3
(5/3-x)x9/5=3,6
1/3(2x-5)=-2/3-3/2=-13/6
2x-5=-13/6:1/3=-13/2
2x=-13/2+5
2x=-3/2
x=-3/2:2=-3/4
Trương Ứng Hòa
Conan bn sai rùi nhé tại sao chỉ còn 1/3 ? còn (-1/3)chứ
2 x 1 x 2 x3 x3 x4 x 4 x 5 x 5 x 6 x9 x8 x 1
2 x 1 x 2 x 3 x 3 x 4 x 4 x 5 x 5 x 6 x 9 x 8 x 1 =
= 2 x 2 x 3 x 3 x 4 x 4 x 5 x 5 x 6 x 9 x 8 x 1
= 4 x 3 x 3 x 4 x 4 x 5 x 5 x 6 x 9 x 8 x 1
= 12 x 3 x 4 x 4 x 5 x 5 x 6 x 9 x 8 x 1
= 36 x 4 x 4 x 5 x 5 x 6 x 9 x 8 x 1
= 144 x 4 x 5 x 5 x 6 x 9 x 8 x 1
= 576 x 5 x 5 x 6 x 9 x 8 x 1
= 2 880 x 5 x 6 x 9 x 8 x 1
= 14 400 x 6 x 9 x 8 x 1
= 86 400 x 9 x 8 x 1
= 777 600 x 8 x 1
= 6 220 800 x 1
= 6 220 800
:)
2 x 1 x 2 x3 x3 x4 x4 x5 x5 x6 x9 x8 x 1
= 6 220 800
Tìm x
a ) x : 5 = 20 x 5
b ) x : 6 = 20 x9
c ) X x 5 = 90
a ) x : 5 = 20 x 5
x : 5 = 100
x = 100 x 5
x = 500
tính tổng: 2 1 x 3 + 2 3 x 5 + 2 5 x 7 + 2 7 x 9 + 2 9 x 11
= 1 - 1 3 + 1 3 - 1 5 + 1 5 - 1 7 + 1 7 - 1 11 + 1 11 = 1 - 1 11 = 10 11
C= 3 / 1 x 1 x 2 x1 + 5 / 2 x2 x 3x2 +...+19 / 9 x9 x 10 x10 . Rut gon C