Tính nhanh: 989898/454545 - 31313131/15151515
Tính nhanh: a) 1988*1996+1997+1985/1997*1996-1995*1996 b) 989898/454545 - 31313131/15151515
a 989898/454545 - 31313131/15151515
b 10101x < 5/10101 + 5/20202 + 5/30303 + 5/40404
c 1/1000 + 13/1000 + 25/1000 + 37/1000 + 49/1000 + ..........+ 87/1000 + 99/1000.
d 2006/2008 x 2001/2004 x 2008/2002 x 2004/2006 x 1001/2001
a=\(\frac{1}{9}\)
c=\(\frac{3069}{500}\)
Tính nhanh
\(A=\frac{595959}{454545}-\frac{14141414}{15151515}\)
\(B=\frac{65+891+135+909}{731-47+69-253}\)
\(A=\frac{595959}{454545}-\frac{14141414}{15151515}\)
\(A=\frac{595959:10101}{454545:10101}-\frac{14141414:1010101}{15151515:1010101}\)
\(A=\frac{59}{45}-\frac{14}{15}\)
\(A=\frac{59}{45}-\frac{42}{45}=\frac{17}{45}\)
\(B=\frac{65+891+135+909}{731-47+69-253}\)
\(B=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47+253\right)}\)
\(B=\frac{200+1800}{800-300}=\frac{2000}{500}=4\)
\(A=\frac{595959}{454545}-\frac{14141414}{15151515}\\ A=\frac{595959:10101}{454545:10101}-\frac{14141414:1010101}{15151515:1010101}\\ A=\frac{59}{45}-\frac{14}{15}=\frac{17}{45}\)
\(B=\frac{65+891+135+909}{731-47+69-253}=\frac{\left(65+135\right)+\left(891+909\right)}{\left(731+69\right)-\left(47-253\right)}=\frac{200+1800}{731+69-47+253}=\frac{200+1800}{500}=\frac{2000}{500}=4\)
\(\frac{595959}{454545}\)- \(\frac{14141414}{15151515}\)
7,5 - 1,5 - 4,5
3 × 25 × 4 + 2 × 75 × 6
Mong các bạn giúp ạ
RÚT GỌN 2 PHÂN SỐ THÌ BẰNG 59/45 VÀ PHÂN SỐ 14/15 TỪ ĐÂY QUY ĐỒNG LÊN
7,5 - 1,5 - 4,5 =7,5 -(1,5 +4,5)
=7,5 -6
= 1,5
3 x 25 x4+2 x 75 x 6=3 x 100 +2 x 450
=300+900
1200
có thể dùng tính chất giao hoán
a 989898/454545 - 31313131/15151515
b 10101x < 5/10101 + 5/20202 + 5/30303 + 5/40404 >
c 1/1000 + 13/1000 + 25/1000 + 37/1000 + 49/1000 + ..........+ 87/1000 + 99/1000.
d 2006/2008 x 2001/2004 x 2008/2002 x 2004/2006 x 1001/2001
a,989898/454545 - 31313131/15151515
=98x10101/45x10101-31x1010101/15x1010101
=98/45-31/15=98/45-93/45=5/45=1/9
tính nhanh :
A = 3333/4545 + 36 / 45 + 666666 / 454545
giúp mình nha
\(A=\frac{3333}{4545}+\frac{36}{45}+\frac{666666}{454545}\)
\(=\frac{33}{45}+\frac{36}{45}+\frac{66}{45}\)
\(=\frac{69}{45}+\frac{66}{45}\)
\(=3\)
Vậy A = 3
#hoctot
Tính A= 989898 * 89-898989*98 / 23+34+45+...+2014^2015
Tính A= 989898 * 89-898989*98 / 23+34+45+...+2014^2015
454545464646.454545475532 = ????