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24 x 235 x 2 - 4 x 226 x 12 + 48
= 48 x 235 - 48 x 226 + 48
= 48 x (235 - 226 + 1)
= 48 x 10
= 480
24 x 235 x 2 - 4 x 226 x 12 + 48
= 48 x 235 - 48 x 226 + 48
= 48 x (235 - 226 + 1)
= 48 x 10 = 480
X+26+X=226
X+X+26=226
(Xx2)+26=226
Xx2 =226-26
Xx2 =200
X =200:2
X =100
7x1x7=49
7x2x7=98
7x3x7=147
7x4x7=196
7x5x7=245
7x6x7=294
7x7x7=343
7x8x7=392
7x9x7=441
7x10x7=490
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70.
4/5 x 15/11 x 2/9 = 8/33
4/7 x 2/5 + 4/7 x 3/5 = 4/7
( 5/7 + 7/8 ) x 2 = 89/28
2/14 + 3/7 - 3/14 x 2 = 1/7
tk mình nhé, mk nhanh nhất
x*3/7=2/5
=>x=2/5:3/7=2/5*7/3=14/15
3/7:x=1/2
=>x=3/7:1/2=6/7
7/5-x=2/3
=>x=7/5-2/3=21/15-10/15=11/15
x x - 4/7 = 15/20
(hình như sai đề, tại vì lớp 4 chưa học lũy thừa)
x * 2/7 -2/3 =1/2
x* 2/7 = 1/2 + 2/3
x* 2/7 = 7/6
x= 7/6 : 2/7
x= 49/12
x : 5/4 + 4/5 =2
x: 5/4 = 2 - 4/5
x: 5/4 = 6/5
x= 6/5 * 5/4
x= 3/2
4/3 x 7/8 x 5
= 7/6 x 5
= 35/6
8/9 x 6/5 x 2/3
= 16/15 x 2/3
= 32/45
4/7 : 5/7 x 10/11
= 4/5 x 10/11
= 8/11
8/13 : 7/13 : 4
= 8/7 : 4
= 2/7
a) X=3/18
b)X=13/10
c)X=11/15
d)X=8/35
e)X=37/21
f)X=65/36
g)X=1/4
h)X=5/4
i)X=7/5
k)X=5/14
l)X=167/96
có nhiều bài khó nếu em ko bik thì kb với cj để cj giúp nha.
a)3/8
b) 13/10
c) 11/15
d) 8/35
e) 37/21
f) 65/36
g) 1/4
h) 5/4
i) 7/5
k) 5/14
l) 167/96
-HT- :)))))))
\(x\): \(\dfrac{2}{3}\) + \(\dfrac{1}{7}\) = \(\dfrac{2}{7}\)
\(x\) : \(\dfrac{2}{3}\) = \(\dfrac{2}{7}\) - \(\dfrac{1}{7}\)
\(x\): \(\dfrac{2}{3}\) = \(\dfrac{1}{7}\)
\(x\) = \(\dfrac{1}{7}\) \(\times\) \(\dfrac{2}{3}\)
\(x\) = \(\dfrac{2}{21}\)
b, \(x\times\dfrac{1}{5}\) + \(x\) \(\times\)\(\dfrac{4}{5}\) = 2
\(x\) \(\times\) ( \(\dfrac{1}{5}\) + \(\dfrac{4}{5}\)) = 2
\(x\) \(\times\) \(\dfrac{5}{5}\) = 2
\(x\) \(\times\) 1 = 2
\(x\) = 2 : 1
\(x\) = 2
\(x\div\dfrac{1}{7}=\dfrac{2}{7}\) \(x\times\dfrac{1}{5}+x\times\dfrac{4}{5}=2\)
\(x=\dfrac{2}{7}\times\dfrac{1}{7}\) \(x\times\left(\dfrac{1}{5}+\dfrac{4}{5}\right)=2\)
\(x=\dfrac{3}{7}\) \(x\times\dfrac{5}{5}=2\)
\(x=2\div1\)
\(x=2\)
# Ninh OSS
a,Cách 1: (6/11 + 5/11 ) x 3/7 Cách 2 :(6/11 + 5/11) x 3/7
= 1 x 3/7 =6/11 x 3/7 + 5/11 x 3/7
= 3/7 = 18/77 + 15/77
= 3/7
b, Cách 1:3/5 x 7/9 - 3/5 x 2/9 Cách 2 :3/5 x 7/9 - 3/5 x 2/9
= 7/15 - 2/15 = 3/5 x (7/9 - 2/9 )
= 1/3 = 3/5 x 5/9
= 1/3
c, Cách 1:(6/7 - 4/7) : 2/5 Cách 2: ( 6/7- 4/7 ) : 2/5
= 2/7 : 2/5 = 6/7 : 2/5 - 4/7 : 2/5
= 5/7 = 15/7 - 10/7
= 5/7
d,Cách 1:8/15 : 2/11 + 7/15 : 2/11 Cách 2:8/15 : 2/11 +7/15 : 2/11
= 88/30 + 77/30 =(8/15+7/15) :2/11
= 11/2 = 1 : 2/11
= 11/2
Bài 2 cậu tự làm nhé !
x*7+x*2=226
=>x*(7+2)=226
=>x*9=226
=>x=226:9
=>x=25,11
x*7 + x*2 = 226
x* ( 7 + 2 ) = 226
x*9 = 226
x = 226 : 9
x = 226/9