Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, (20.2^4+12.2^4-48.2^2):8^2
=(20.2^4+12.2^4-12.2^2.2^2):8^2
=(20.2^4+12.2^4-12.2^4):2^6
=2^4.(20+12-12):2^6
=2^4.20:2^6
=2^4.2^2.5:2^6
=5
b,
=5^4.(75+175):15625
=5^4.250:15625
=156250:15625
=10
c, Thì chắc bạn chép sai đề bài rồi,đề bài của mình thế này cơ:
16 x 64 x 82 : ( 43 x 25 x 16 )
=2^4.2^6.2^6:(2^6.2^5.2^4)
=2^18:2^5
=2^13
K MÌNH NHA
Tính:
a,245-4×[16÷8+2×(4×3^2-9)]
=241×(4×27)
=241×108
=26028
b,375÷5^3+(3^8+3^6+2,2^3)
=375÷125+(7290+10,648)
=3+7300,648
=7303,648
a) 245 - 4 [ 16 : 8 + 2 ( 4 . 32 - 9 ) ] = 21
b) 375 : 53 + ( 38 + 36 + 2 , 23 ) = 7295.8
2x - 138 = 23 . 32
=> 2x - 138 = 72
=> 2x = 72 + 138
=> 2x = 210
=> x = 105
10 + 2x = 43 . 42
10 + 2x =1024
2x = 1024 - 10
2x = 1014
x = 507
(3x - 24) . 73 = 2.74
3x - 24 = 2 . 74 : 73
3x - 16 = 14
3x = 14 + 16
3x = 30
x = 10
x4 = 16
=> x4 = 24
=> x = 2
Ko ghi lại đầu bài
7A= 7(1+7+7 mũ 2+7 mũ 3 +...+7 mũ 2019) { 2}
7A=7+7 mũ 1+ 7 mũ 2+ 7 mũ 3+7 mũ 4 +...+7 mũ 2020
7A-A= Lấy { 2 } trừ đầu bài
6A=7 mũ 2020 - 1
A= ( 7 mũ 2020 -1 ) : 6
tương tự với hai ý kia
#chúc bạn hok tốt
bạn nên xem lại ý c nha
7A= 7+ 72+ 73+ ............+72019+72020
7A- 7= 72020- 1
6A= 72020-1
A= 72020-1:6
4B= 4+ 42+ 43+ ..........+ 42021
4B- B= 42021-1
3B= 42021-1
B= 42021-1: 3
BẠN THÔNG CẢM CÂU CUỐI MIK KO BÍT LÀM !!!!!
a, \(6^2:4.3+2.5^2=36:4.3+2.25\)'
\(=9.3+50=27+50=77\)
b, \(2\left(5.4^2-18\right)=2\left(5.16-18\right)\)
\(=2.5.16-2.18=10.16-36\)
\(=160-36=124\)
c, \(5.4^2-18:3^2=5.4.4-18:3^2\)
\(=20.4-18:9=80-2=78\)
\(a,6^2:4.3+2.5^2\)
\(=9.3+2.25\)
\(=27+50\)
\(=77\)
\(b,2.\left(5.4^2-18\right)\)
\(=2.\left(80-18\right)\)
\(=2.62\)
\(=124\)
\(c,5.4^2-18:3^2\)
\(=5.16-18:9\)
\(=80-2\)
\(=78\)
\(d,3^3.18-3^3.12\)
\(=3^3.6.3-3^3.6.2\)
\(=3^3.6.\left(3-2\right)\)
\(=27.6.1\)
\(=162\)
\(e,39.213+84.39\)
\(=39.\left(213+84\right)\)
\(=39.297\)
\(=11583\)
\(j,80-\left[130-\left(12-4\right)^2\right]\)
\(=80-\left[130-8^2\right]\)
\(=80-66\)
\(=14\)
Học tốt
Đặt \(A=\frac{3^2\cdot4^2\cdot2^{32}}{11\cdot2^{13}\cdot4^{11}-16^9}\)
\(A=\frac{3^2\cdot\left(2^2\right)^2\cdot2^{32}}{11\cdot2^{13}\cdot\left(2^2\right)^{11}-16^9}\)
\(A=\frac{3^2\cdot2^4\cdot2^{32}}{11\cdot2^{13}\cdot2^{22}-16^9}=\frac{3^2\cdot2^{36}}{11\cdot2^{35}-\left(2^4\right)^9}\)
\(A=\frac{3^2\cdot2^{36}}{11\cdot2^{35}-2^{36}}\)
\(A=\frac{3^2\cdot2^{36}}{11\cdot2^{35}-2\cdot2^{35}}\)
\(A=\frac{3^2\cdot2^{36}}{\left(11-2\right)\cdot2^{35}}=\frac{9\cdot2^{36}}{9\cdot2^{35}}=\frac{2^{36}}{2^{35}}=2\)
Bài làm:
\(\frac{3^2.4^2.2^{32}}{11.2^{13}.4^{11}-16^9}\)
\(=\frac{3^2.\left(2^2\right)^2.2^{32}}{11.2^{13}.\left(2^2\right)^{11}-\left(2^4\right)^9}\)
\(=\frac{3^2.2^4.2^{32}}{11.2^{13}.2^{22}-2^{36}}\)
\(=\frac{3^2.2^{36}}{11.2^{35}-2^{36}}\)
\(=\frac{3^2.2^{36}}{\left(11-2\right).2^{35}}\)
\(=\frac{9.2^{36}}{9.2^{35}}\)
\(=2\)
Học tốt
a. \(\left(20.2^4+12.2^4-48.2^2\right):8^2\)
= \(\left[2^4.\left(20+12\right)-48.4\right]:64\)
= \(\left[16.32-192\right]:64\)
= \(\left[512-192\right]:64\)
= \(320:64\)
= \(5\)
b. \(\left(75.5^2+175.54\right):\left(20.125-625.75\right)\)
= \(\left(75.25+175.54\right):\left(20.125-625.75\right)\)
= \(\left(1875+9450\right):\left(2500-46875\right)\)
= \(11325:\left(-44375\right)\)
= \(\dfrac{-453}{1775}\)
c. \(\left[6.64.8^2:\left(4^3-2^5.16\right)\right]\)
= \(\left[6.64.64:\left(64-32.16\right)\right]\)
= \(\left[24576:\left(64-512\right)\right]\)
= \(\left[24576:\left(-448\right)\right]\)
= \(\dfrac{-387}{7}\)
Trả lời:
Ta có : 1.22= 1.2.2=1.2.(3-1)=1.2.3-1.2
2.32= 2.3.3=2.3.(4-1)=2.3.4-2.3
.................................................
98.992= 98.99.99=98.99.(100-1)=98.99.100-98.99
A=1.2.3 - 1.2 + 2.3.4 - 2.3 + ... + 98.99.100 - 98.99 hay A=1.2.3 + 2.3.4 +...+ 98.99.100 - (1.2 + 2.3 + ... + 98.99) = B - C
B=1.2.3 + 2.3.4 + ... + 98.99.100
B.4=1.2.3.4 + 2.3.4.(5 - 1) + ... + 98.99.100.(101 - 97)= 98.99.100.101
=> 98.99.100.101:4= 24497550
C=1.2 + 2.3 + ... + 98.99
C.3=1.2.3 + 2.3.(4 - 1) + ... + 98.99.(100 - 97)= 98.99.100
=> 98.99.100:3= 323400
Vậy A= 24497550 - 323400 = 24174150
Có A = 4 + 2 2 + 2 3 + 2 4 +. . . + 2 20
=>A=1+1+2+22+ 2 3 + 2 4 +. . . + 2 20
Gọi 1+2+22+ 2 3 + 2 4 +. . . + 2 20 là B
có B=1+2+22+ 2 3 + 2 4 +. . . + 2 20
=>2B=2+22+23+24+25+....+221
2B-B=(2+22+23+24+25+....+221)-(1+2+22+ 2 3 + 2 4 +. . . + 2 20 )
B=221-1
Có A=1+B
mà B=221-1
=>A=221-1+1
A=221
Tham khảo câu hỏi tương tự có nha bạn ^_^