a)\(\frac{45^{10}.5^{10}}{75^{10}}\)
b)\(\frac{8^{10}+4^{10}}{8^4+4^{11}}\)
c)\(\frac{4^{20}-2^{20}+6^{20}}{6^{20}-3^{20}+9^{20}}\)
d) \(\frac{14^{16}.21^{32}.45^{48}}{10^{16}.15^{32}.7^{96}}\)
\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}\)
\(a.\frac{27.45+27.55}{2+4+6+...+14+16+18}=\frac{27.100}{\frac{\left(2+18\right).9}{2}}=30\)
\(b.\frac{26.108-26.12}{32-28+24-20+16-12+8-4}=\frac{26\left(108-12\right)}{\left(32-28\right).4}=\frac{26.96}{4.4}=156\)
\(c.\frac{27.4500+135.550.2}{2+4+6+...+14+16+18}=\frac{270.450+270.550}{\frac{\left(2+8\right).9}{2}}\)
\(d.\frac{48.700-24.45.20}{45-40+35-30+25-20+15-10+5}=\frac{48.700-48.450}{5.5}\)\(=\frac{48\left(700-450\right)}{25}=\frac{48.250}{25}=480\)
#ĐinhBa
Tính nhanh :
A = 14^16 - 21^32 . 35^68 / 10^16 .15^22 . 7^96
B = 4^20 - 2^20 + 6^20 / 6^20 - 3^20 + 9^20
\(A=\frac{14^{16}-21^{32}.35^{68}}{10^{16}.15^2.7^{96}}=\frac{2^{16}.7^{16}-3^{32}.7^{32}.7^{68}.5^{68}}{5^{16}.2^{16}.3^2.5^2.7^{96}}\)
\(A=\frac{2^{16}.7^{16}-3^{32}.7^{100}.5^{68}}{5^{18}.2^{16}.3^2.7^{96}}=\frac{7^{16}.\left(2^{16}-3^{32}.7^{84}.5^{68}\right)}{5^{18}.2^{16}.3^2.7^{96}}=\frac{2^{16}-3^{32}.7^{84}.5^{68}}{5^{18}.2^{16}.3^2.7^{88}}\)
\(B=\frac{4^{20}-2^{20}+6^{20}}{6^{20}-3^{20}+9^{20}}=\frac{2^{40}-2^{20}+2^{20}.3^{20}}{2^{20}.3^{20}-3^{20}+3^{40}}=\frac{2^{20}.\left(2^{20}-1+3^{20}\right)}{3^{20}.\left(2^{20}-1+3^{20}\right)}\)
\(B=\frac{2^{20}}{3^{20}}\)
Câu 1: what time is it?
10:15: it’s a quarter past ten
1. 20:15 it’s a quarter past eight p.m
2. 07:40 it’s twenty to eight.
3. 14:50
4. 18:23
5. 06:17
6. 20:45
7. 11:00
8. 14:55
9. 21:46
10. 22:30
11. 12:15
12. 05:42
13. 16:23
14. 10:45
15. 17:08
các bạn ơi giúp mình giải bài này với!!!!!
10:15: it’s a quarter past ten
1. 20:15 it’s a quarter past eight p.m.
2. 07:40 it’s twenty to eight.
3. 14:50: it's fifty past two p.m.
4. 18:23: it's twenty-three past six p.m.
5. 06:17: it's seventeen past six
6. 20:45: it's a quarter to nine p.m.
7. 11:00: it's eleven o'clock
8. 14:55: it's fifty-five past two p.m. / five to three p.m
9. 21:46: it's forty-six past nine p.m.
10. 22:30: it's half past ten p.m.
11. 12:15: it's a quarter past twelve
12. 05:42: it's forty-two past five
13. 16:23: it's twenty-three past four p.m.
14. 10:45: it's ten forty-five
15. 17:08: it's eight past five p.m.
Minh Châu Tiến Đạt thân mến, với bài đọc thời gian này em chỉ cần lưu ý:
- Cách đọc 1: giờ trước, phút sau: số giờ + số phút (+ p.m. hoặc a.m. hoặc in the evening / in the morning)
- Cách đọc 2: phút trước, giờ sau:
Đối với phút thứ 1-30, chúng tôi sử dụng PAST sau phút. Ex: eight past ten (10h08p)
Đối với phút thứ 31-59, chúng ta sử dụng TO sau phút. Ex: eight to ten (9h52p)
✽ O'clock được sử dụng với giờ đúng, KHÔNG có phút. Ex: 10 o'clock (10:00) -
✽ 12:00 Đối với 12h, có bốn cách diễn đạt bằng tiếng Anh:
midday = noon / midnight / twelve o'clock
✽15 = a quarter (1/4 của 60 phút / 1 giờ = 15 phút)
✽ a.m. (am) được dùng cho buổi sáng và p.m. (pm) cho buổi chiều và đêm.
Phản hồi đến em.
B1: Tính
a) (1/4)44. (1/2)12
b) \(\frac{3^{17}.81^{11}}{27^{10}.9^{15}}
\)
c)\(\frac{14^{16}.21^{32}.35^{48}}{10^{16}.15^{32}.7^{96}}\)
d)\(\frac{\left(5^4-5^3\right)^3}{125^4}\)
e)\(\frac{10^3+5.10^2+5^3}{6^3+3.6^2+3^3}\)
1) 15 - 98 + 91 - 75 + 98 - 91 - 13
2) 5 - ( 4 - 7 + 12 ) + ( 4 - 7 + 12 ) - 10
3) 20 - ( 25 - 98 + 12 ) + ( 25 - 98 - 72 )
4) - ( 17 - 4 + 13 + | -17 | + 13 )
5) | -16 | - ( 5 - 8 + 7) - ( - 5 ) - 8
6) -20 + ( 3 - 16 + 7 ) - ( 3 - 16 + 7 )
7) 32 - ( 5 - 8 + 32 ) + ( 5 - 8 + 6 )
8) -20 - ( 25 - 11 + 8 ) + ( 25 - 8 + 20 )
1)-73
2)-5
3)-64
4)-56
5)9
6)-20
7)6
8)-2
Tick nha
đăng tùng câu một thui bạn
bạn làm thế chắc tụi mk xỉu gần hết
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50.
Có ai rảnh đâu mà đi ngồi cộng ngần đấy số ra.
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+30+31+32+32+...+1000000
số số hạng là :
( 1000000 - 1 ) : 1 + 1 = 1000000
tổng là :
( 1000000 + 1 ) x 1000000 : 2 = 500000500000
đáp số : 500000500000
1+2+3+4+5+6+7+7+8+9+10+11+12+13+14+45+15+16+17+18+19+20+21-56+56+48+52+78+84+54+2545+455+1454+1256-23+56+586=
1+2+3+4+....-56+56+48.......-23+56+586=6928