B=(-3x7^4+7^3)/(7^5x6-7^3x2)
Hệ số cao nhất của đa thức 5 x 6 + 6 x 5 + x 4 - 3 x 2 + 7 là:
A. 6
B. 7
C. 4
D. 5
5/39x(7 4/5x1 2/3+8 1/3x7 4/5)
`5/39xx(7 4/5xx1 2/3+8 1/3xx7 4/5)`
`=5/39xx(39/5xx5/3+25/3xx39/5)`
`=5/39xx39/5(5/3+25/3)`
`=1xx30/3`
`=10`
4/3x7+5/7x12+1/12x13+7/13x20+3/20x23=
bài 3: tính rồi rút gọn: a, 5/3x4/5. b, 2/3x3/5. c, 7/6x6/5. d, 8/5x5/7. e, 7/6x6/7. g, 9/5x6/2. h, 4/3x3/5
các bn giúp mik với
a, \(\dfrac{20}{15}=\dfrac{4}{3}\)
b, \(\dfrac{6}{15}=\dfrac{2}{5}\)
c, \(\dfrac{42}{30}=\dfrac{7}{5}\)
d, \(\dfrac{40}{35}=\dfrac{8}{7}\)
e, \(\dfrac{42}{42}=1\)
g, \(\dfrac{54}{10}=\dfrac{27}{5}\)
h, \(\dfrac{12}{15}\)
tính thuận tiện nhất 4/7x3/7+4/5x6/7-4/5x7/14
`4/7xx3/7+4/5xx6/7-4/5xx7/14`
`=4/7xx3/7+4/5xx(6/7-7/14)`
`=4/7xx3/7+4/5xx5/14`
`=12/49+2/7`
`=26/49`
=4/7x3/7+4/5x(6/7-7/14)
=4/7x3/7+4/5x5/14
=12/49+2/7
=26/49
bài 1 tính nhanh
a 6/5x1/7+3/5x6/7 = ?
b 6/7x 3 2/7 x3
a, 24/35
b, 13/7
k cho mih
a, 14,51:1,5-9,81:1,5
b, 5/9:4/7+13/3x7/4
4/3x7 + 5/7x12 + 1/12x13 + 7/13x20 + 3/20x23
Giải ra cho mình nhé
4/3x7 + 5/7x12 + 1/12x13 + 7/13x20 + 3/20x23
=1/3-1/7+1/7-1/12+1/12-1/13+1/13-1/20+1/20-1/23
=1/3-1/23
=20/69
Kanzaki Mizuki
\(=\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{12}+\frac{1}{12}-\frac{1}{13}+\frac{1}{13}-\frac{1}{20}+\frac{1}{20}-\frac{1}{23}\)
\(=\frac{1}{3}-\frac{1}{23}\)
\(=\frac{20}{69}\)
a.7/12+-5/8+2/3
b.2/7+3/4
c.-5/6+2/9+7/12
d.-5/6-7/8
e.-2/13-3/7+-2/3x7/7
f.(-5,6)x2+7,8
g.2,8:(-0,7)
tham khảo
a. 5/8
b. 29/28
c. -1/36
d. -41/24
e. -341/273
f. -17/5
g. -4