a,\(6\cdot x\cdot5=240\)
\(x\cdot30=240\)
\(x=8\)
b, \(7\cdot\left(x:7\right)=883\)
\(x:7=\frac{883}{7}\)
\(x=883\)
cảm ơn
okkkkkkkkkkkkkkkkkkkkkk
cúnnnnnnnnnnnnnnnnnnnnnn
a,\(6\cdot x\cdot5=240\)
\(x\cdot30=240\)
\(x=8\)
b, \(7\cdot\left(x:7\right)=883\)
\(x:7=\frac{883}{7}\)
\(x=883\)
cảm ơn
okkkkkkkkkkkkkkkkkkkkkk
cúnnnnnnnnnnnnnnnnnnnnnn
a) X x 6 x 7.......7 x X x 6
b) X x 5 x 8....X x 5 x 7
c) 2 x X x 3......X x 3
Mẫu : Ta có: 5 x 6 x 7 x 9 = 5 x 6 x 7 x 9 = 5/6
12 7 x 27 6 x 2 x 7 x 9 x 3
a) 3 x 4 x 7 =
12 x 8 x 9
b)4 x 5 x 6 =
12 x 10 x 8
c)5 x 6 x 7=
12 x 14 x 15
Ai nhanh nhất TiCk ChO !
Tính nhanh các biểu thức sau :
a) (45 – 5 x 9) x 1 x 2 x 3 x 4 x 5 x 6 x 7
b) (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10) x (72 – 8 x 8 – 8)
c) (36 – 4 x 9) : (3 x 5 x 7 x 9 x 11)
d) (27 – 3 x 9) : 9 x 1 x 3 x 5 x 7
Tìm x
x - 4/5 = 3/7
x + 3/7 = 4/5
19/20 - x = 8/5 - 3/4
4/5 x X = 6/9 - 4/7
x : 7/9 = 6/8
2/3 - x/6 = 6/18
Tìm x
x - 4/5 = 3/7
x + 3/7 = 4/5
19/20 - x = 8/5 - 3/4
4/5 x X = 6/9 - 4/7
x : 7/9 = 6/8
2/3 - x/6 = 6/18
Bài 1 : Tính bằng hai cách
a) ( 6/11 + 5/11 ) x 3/7 =
b) 3/5 x 7/9 - 3/5 x 2/9 =
c) ( 6/7 - 4/7 ) : 2/5 =
d) 8/15 : 2/11 + 7/15 : 2/11 =
Bài 2 : Tính
a) 2 x 3 x4/3 x 4 x 5 =
b) 2/3 x 3/4 x 4/5 : 1/5 =
c) 1 x 2 x 3 x 4 / 5 x 6 x 7 x8 =
d) 2/5 x 3/4 x 5/6 : 3/4 =
tính bằng cách thuận tiện nhất :
1/2 x 2/3 x 3/4 x 4/5 x 5/6
1/10 x 2/9 x 3/8 x 4/7 x 5/6 x 6/5 x 7/4 x 3/8 x 9/2
9/7 x 4/5 - 1/5 x 9/7 - 2/7 x 1/6 -2/7 x 5/6
#Dobangiaiduoc
Cho m= 3/5 x (6/7 x 8/9 x 10/11 x ... x 32/33) và N = 5/6 x 7/8 x 9/10 x ... x 31/32