tinh nhanh
15 x 14 - 1
13 x 14 x 15
Tính nhanh
a, 54 x 113 + 45 x 113 + 113
b, 3 x 7/10 + 7/10 x 5 + 2 x 14/20
a,
= 113 x (54 + 45 + 1)
= 113 x 100
= 11300
b,
= 7/10 x (3 + 5 + 2)
= 7/10 x 10
= 7
a, 54 x 113 + 45 x 113 + 113
= 113 x ( 54+45+1)
= 113 x 100
= 11300
b, 3 x 7/10 + 7/10 x 5 + 2 x 14/20
= 7/10 + ( 3+5+2)
= 7/10 x 10
= 7
rut gon roi tinh 17/51 x 45/30
24/15 x 56/72 x10 14
32/48 x 35/21 x 63/14 x 9/ 30
Câu 1: \(\frac{17}{51}\)x \(\frac{45}{30}\)= \(\frac{1}{3}\)x \(\frac{3}{2}\)
= \(\frac{1}{2}\).
Câu 2: \(\frac{24}{15}\)x \(\frac{56}{72}\)x \(\frac{10}{14}\)= \(\frac{8}{5}\)x \(\frac{7}{9}\)x \(\frac{5}{7}\)
= \(\frac{56}{45}\)x \(\frac{5}{7}\)
= \(\frac{8}{9}\)
Câu 3: \(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{3}{2}\)
k nha
a)17/51x45/40=1/3x3/2=3/6=1/2
b)24/15x56/72x10/14=8/5x7/9x5/7=8/9
c)32/48x35/21x63/14x9/30=2/3x5/3x9/2x3/10=3/2
x x 134 -x x24 -x x 10 = x x ( 134 - 24 - 10)
x = x x 100
x = 1300 : 100
x = 13
69 x 113 - 27 x 69 + 69 x 14 + 31
= 69 x ( 113 - 27 + 14 ) + 31
= 69 x 100 +31
= 6900 + 31
=6931
=69x(113-27+14)+31
=69x100+31
=6900+31
=6931
69 x 113 - 27 x 69 + 69 x 14 + 31
= 69 x ( 113 - 27 + 14 ) + 31
= 69 x 100 + 31
= 6900 + 31
= 6931
Cho f(x)=x^17-2015*x^16|+2015*x^15-2015*x^14+...+2015*x-1
Tinh f(2014)
Với x = 2014 => x + 1 = 2015
Ta có :
\(f\left(x\right)=x^{17}-2015x^{16}+2015x^{15}-2015x^{14}+....+2015x-1\)
<=> \(f\left(x\right)=x^{17}-\left(x+1\right)x^{16}+\left(x+1\right)x^{15}-\left(x+1\right)x^{14}+....+\left(x+1\right)x-1\)
<=> \(f\left(x\right)=x-1\)
<=> \(f\left(2014\right)=2014-1=2013\)
tinh p=x\(^{15}\)-2018x\(^{14}\)+2018x\(^{13}\)-2018x\(^{12}\)+...+2018x\(^3\)-2018x\(^2\)+2018x-2018 ;voi x=2017
Ta có: x=2017
nên x+1=2018
Ta có: \(P=x^{15}-2018x^{14}+2018x^{13}-2018x^{12}+...+2018x^3-2018x^2+2018x-2018\)
\(=x^{15}-\left(x+1\right)\cdot x^{14}+\left(x+1\right)\cdot x^{13}-\left(x+1\right)\cdot x^{12}+...+\left(x+1\right)\cdot x^3-\left(x+1\right)\cdot x^2+\left(x+1\right)\cdot x-\left(x+1\right)\)
\(=x^{15}-x^{15}-x^{14}+x^{14}+x^{13}-x^{13}+...+x^3-x^3+x^2-x^2+x-x-1\)
=-1
tinh nhanh M= x^15-8x^14+8x^13-8x^12+...- 8x^2+8x-2015 voi x=7
f(7)=7^15-8.7^14+8.7^13-8.7^12+...
-8.7^2+8.7-5=
= -7^14+8.7^13-8.7^12+...-8.7^2+8.7-5=
=7^13-8.7^12+...-8.7^2+8.7-5=
= -7^12+...-8.7^2+8.7-5=
=...= -7^2+8.7-5=7-5=2
Kết quả là 2
1:tính bằng cách thuận tiện nhất:
a)54 x 113 + 45 x 113 + 113 b)3/7 + 4/9 + 8/14 + 10/18
2:tính giá trị biểu thức
a)9/5 - 1/2 + 1/3
b)12/9 x 1/12 + 1/6 x 12/9
c)3/4 x (5/6 + 2/3)
d)3/2 - 2/3 : 2
1.a,=(54+45+1).113
=100.113
=11300
b,=(3/7+8/14)+(4/9+10/18)
=1+1
=2
2.a,=13/10+1/3
=49/30
b,=12/9.(1/12+1/6)
=12/9.1/4
=1/3
c,=3/4.3/2
=9/8
d,=3/2-1/3
=7/6
1:tính bằng cách thuận tiện nhất:
a)54 x 113 + 45 x 113 + 113
= 54 x 113 + 45 x 113 + 113x1
=113 x(54+45+1)
= 113x100
=1300
b)3/7 + 4/9 + 8/14 + 10/18
=(3/7+8/14)+(4/9+10/18)
= 1 + 1
=2
tinh gia tri bieu thuc A tai x=-1/2; y=4;z=6
A=x^2y+(-x^3-3xyz)-(4-3xyz)+(-14^15)^0
\(A=x^2y-x^3-3xyz-4+3xyz+1=x^2y-x^3-3\)
\(=\dfrac{1}{4}\cdot4-\left(-\dfrac{1}{8}\right)-3\)
=1-3+1/8
=-2+1/8=-15/8
F(x)=x^2014-14.x^13+14.x^12-14.x^11+............-14.x+14.tính f(13)
Ai pít thì giúp mk nhé chú ý k đăng câu trả lời linh tinh ai làm đúng cụ thể thì mk sẽ like cho