Tinh bang cahc thuan tien
5 x 12 x 3 x 7 / 3x8x7x5
2 x 5 x 4 x 6 / 4 x 3 x 5 x 7 =
tinh bang cach thuan tien nhat : 3/4 x 4/5 + 5/6 x 6/7 x 7/8
giup minh
tinh bang cach thuan tien
3/7 x 5/6 + 4/7 x 5/6
3/7*5/6+4/7*5/6
= 5/6*(3/7+4/7)
=5/6*1
=5/6
Tinh gia tri bieu thuc bang cach thuan tien nhat :
A= 1/10 x 2/9 x 3/8 x 4/7 x 5/6 x 6/5 x 7/4 x 8/3 x 9/2
Tinh bang cach thuan tien nhat:
a/ 7,8 x 34,5 + 15,5 x 7,8
b/ 3/7 x 11/5 + 4/7 x 11/5
a/ = 7,8 x ( 34,5 + 15,5 ) = ..... tự tính
b/ 11/5 x (3/7 +4/7 )= .......tự tính
mk nhé
a, 7,8 x 34,5 +15,5 x 7,8 = 7,8 x ( 34,5 + 15,5) =7,8 x 50 =390
b, 3/7 x 11/5 +4/7 x 11/5 = 11/5 x ( 3/7 +4/7) = 11/5 x1=11/5
=.= hok tốt!!
7,8 . (34,5 + 15,5 )
= 7,8 .50.0
=39,000
giup minh
tinh bang cach thuan tien
7/9 x 5/16 : 5/9 x 4/7
7/9 x 5/16 : 5/9 x4/7
=7/9 x 5/16 x9/5 x 4/7
=7/9 x 45/80 x 4/7
=7/9 x 9/16 x 4/7
=7 x 9 x 4 /9 x 16 x 7
=1/4
tinh bang cach thuan tien 3/5 x 7/9 + 11/9 x 3/5 - 3/10. B 14/13 : 1/2 + 3/13 x2 -2 x 7/13
a) 3/5x7/9+11/9x3/5
=3/5 x(7/9+11/9)
= 3/5x2
=6/5
b)14/13:1/2+3/13x2-2x7/13
= 14/13 x 2 +3/13 x2 - 2x7/13
=2 x (14/13 +3/13 -7/13)
= 2 x 10/13
= 20/13
a) 3/5 x 7/9 + 11/9 x 3/5 - 3/10
= 3/5 x 7/9 + 11/9 x 3/5 - 3/5 x 2
= 3/5 x ( 7/9 + 11/9 - 2 )
= 3/5 x 0
= 0
b) 14/13 : 1/2 + 3/13 x 2 - 2 x 7/13
= 14/13 x 2/1 + 3/13 x 2 - 2 x 7/13
= ( 14/13 + 3/13 - 7/13 ) x 2
= 10/13 x 2 = 20/13
chẳng hiể gì cả
Tinh bang cach thuan tien nhat:
a) 1/3 + 1/4 + 2/3 + 3/4
b) 1/2 + 1/3 - 1/5 + 1/6
c) 2/3 x 4/5 + 1/3 x 4/5
d) 2/3 x 4/5 - 1/3 x 4/5
a)1/3+1/4+2/3+3/4
=(1/3+2/3)+(1/4+3/4)
=1+1
=2.
b)1/2+1/3-1/5+1/6
=(1/2+1/3+1/6)-1/5
=1-1/5
=4/5
c)2/3x4/5+1/3x4/5
=4/5x(2/3+1/3)
=4/5x1
=4/5
d)2/3x4/5-1/3x4/5
=4/5x(2/3-1/3)
=4/5x1/3
=4/15
tinh bang cach thuan tien
(x+5)+(x+6)+(x+7)+(x+8)=58
giup minh nhe minh can gap
(x+5)+(x+6)+(x+7)+(x+8)=58
=> x+5+x+6+x+7+x+8=58
=> 4x+26=58
=> 4x=32
=> x=8
Vậy x=8
tk cho mk nha
(bn mới lớp 5 à ,thế thì dấu " =>" là dấu suy ra)
*****Chúc bạn học giỏi*****
(x+5)+(x+6)+(x+7)+(x+8)=58
nên x+5+x+6+x+7+x+8=58
nên 4x+26=58
nên 4x=58-26=32
nên x=32:4=8
vậy x=8
Tim 2 so co tich bang 6 tong bang 5
Tinh x:4+3=7
Tnh 18_6÷x=12