4x8+1<x+2<5x7
86x87:67x56+1/7:7/6-2/4x8
1/2x4+1/4x8+1/8x16+1/16x32+1/32x64
Ai giúp mình với!!!!!
9/5 : 7/4 + 3/4x8/7 7 x 3/14 - 1/14
9/5 : 7/4 + 3/4 x 8/7
= (9/5 : 8/7) x (7/4 + 3/4)
= 63/40 x 5/2
= 63/16
7 x 3/14 - 1/14
= 3/2 - 1/4
= 5/4
\(\dfrac{9}{5}:\dfrac{7}{4}+\dfrac{3}{4}\times\dfrac{8}{7}\)
\(=\dfrac{9}{5}\times\dfrac{4}{7}+\dfrac{3}{4}\times\dfrac{8}{7}\)
\(=\dfrac{36}{35}+\dfrac{6}{7}\)
\(=\dfrac{66}{35}\)
\(7\times\dfrac{3}{14}-\dfrac{1}{14}\)
\(=\dfrac{3}{2}-\dfrac{1}{14}\)
\(=\dfrac{10}{7}\)
phân tích đa thức thành nhân tử
x12+4
4x8+1
Giải nhanh giúp nha !
1/2x4+1/4x6+1/4x8...1/96x98+1/98x100
Tính tổng
4x8=?
4x8+19-x=28
32 + 19 - x = 28
51 - x = 28
x = 51 - 28 = 23
Lời giải:
$4\times 8+19-x=28$
$32+19-x=28$
$51-x=28$
$x=51-28=23$
4x8+19-x=28
4x8+(19-x)=28
32+(19-x)=28
19-x=28-36
19-x=(-8)
x=19-(-8)
x=19+8
x=27
Tính nhanh
a) 3/4x8/5x5/9
b)6/7:3/14:1/2
\(\frac{3}{4}\cdot\frac{8}{5}\cdot\frac{5}{9}=\frac{2}{3}\)
\(\frac{3}{7}:\frac{3}{14}:\frac{1}{2}=4\)
a) \(\frac{3}{4}x\frac{8}{5}x\frac{5}{9}=\frac{3x8x5}{4x5x9}=\frac{120}{180}=\frac{2}{3}\)
b) \(\frac{6}{7}:\frac{3}{14}:\frac{1}{2}=\frac{6}{7}x\frac{14}{3}x\frac{1}{2}=\frac{84}{42}=2\)
3:4x8:2-2+8x2