Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a,\(5^3.2-100:4+2^3.5\)
= 125 . 2 - 25 + 8 . 5
= 250 - 25 + 40
= 265
b, \(6^2:9+50.2-3^3.3\)
= 36 : 9 + 100 - 27 . 3
= 4 + 100 - 81
= 23
b) \(5^3\cdot2-100:4+2^3\cdot5\)
\(=125\cdot2-25+8\cdot5\)
\(=250-25+40\)
\(=225+40=265\)
c) \(6^2:9+50\cdot2+3^3-3\)
\(=36:9+100+27-3\)
\(=4+100+27-3\)
\(=104+27-3=131-3=128\)
d) \(3^2\cdot5+2^3\cdot10-81:3\)
\(=9\cdot5+8\cdot10-27\)
\(=45+80-27\)
\(=125-27=98\)
e) \(5^{13}:5^{10}-25\cdot2^2\)
\(=5^{13-10}-5^2\cdot2^2\)
\(=5^3-\left(5\cdot2\right)^2\)
\(=125-10^2\)
\(=125-100=25\)
f) \(20:2^2+5^9:5^8\)
\(=20:4+5^{9-8}\)
\(=5+5^1=5+5=10\)
g) \(100:5^2+7\cdot3^2\)
\(=10^2:5^2+7\cdot9\)
\(=\left(10:5\right)^2+63\)
\(=2^2+63=4+63=67\)
h) \(84:4+3^9:3^7+5^0\)
\(=21+3^{9-7}+1\)
\(=21+3^2+1\)
\(=21+9+1=30+1=31\)
i) \(29-\left[16+3\cdot\left(51-49\right)\right]\)
\(=29-\left[16+3\cdot2\right]\)
\(=29-\left[16+6\right]\)
\(=29-22=7\)
j) \(\left(15^{19}:5^{17}+3\right)\cdot0:7\)
\(=\left[\left(3\cdot5\right)^{19}:5^{17}+3\right]\cdot0\)
Vì số nào nhân cho 0 cũng bằng 0 nên giá trị biểu thức trên bằng 0
k) \(7^9:7^7-3^2+2^3\cdot5\)
\(=7^{9-7}-9+8\cdot5\)
\(=7^2-9+40\)
\(=49-9+40=40+40=80\)
l) \(1200:2+6^2\cdot2^1+18\)
\(=600+36\cdot2+18\)
\(=600+72+18\)
\(=600+\left(72+18\right)=600+90=690\)
m) \(5^9:5^7+70:14-20\)
\(=5^{9-7}+5-20\)
\(=5^2+5-20\)
\(25+5-20=30-20=10\)
Những câu sau mình làm sau nhé bạn!!!!!!!
1; 73.52.54.76:(55.78)
= (73.76).(52.54) : (55.78)
= 79.56: (55.78)
= (79:78).(56:55)
= 7.5
= 35
2; 33.a7.3.a2:(34.a6)
= (33.3).(a7.a2): (34.a6)
= 34.a9: (34.a6)
= (34:34).(a9:a6)
= a3
Bài 1. Rút gọn
a)
\(7^3\cdot5^2\cdot5^4\cdot7^6:(5^5\cdot7^8)\)
\(=7^{3+6}\cdot5^{2+4}:(5^5\cdot7^8)\)
\(=7^9\cdot5^6:(5^5\cdot7^8)\)
\(=7^{9-8}\cdot5^{6-5}\)
\(=7\cdot5\)
\(=35\)
b)
\(3^3\cdot a^7\cdot3\cdot a^2:(3^4\cdot a^6)\)
\(=3^{3+1}\cdot a^{7+2}:(3^4\cdot a^6)\)
\(=3^{4-4}\cdot a^{9-6}\)
\(=1\cdot a^3\)
\(=a^3\)
c)
\(7^3\cdot11^4\cdot a^8\cdot b^7: (7^2\cdot11^2\cdot a^5\cdot b^6)\)
\(=7^{3-2}\cdot11^{4-2}\cdot a^{8-5}\cdot b^{7-6}\)
\(=7\cdot11^2\cdot a^3\cdot b\)
\(=847a^3b\)
d)
\((2^5\cdot a^4\cdot b^3)\cdot(2^3\cdot a\cdot b^5):(2^7\cdot a^3\cdot b^7)\)
\(=2^{5+3}\cdot a^{4+1}\cdot b^{3+5}:(2^7\cdot a^3\cdot b^7)\)
\(=2^{8-7}\cdot a^{5-3}\cdot b^{8-7}\)
\(=2\cdot a^2\cdot b\)
\(=2a^2b\)
12 + ( 5 + x ) = 20 5.22 + ( x + 3 ) = 52 23 + ( x + 3 ) = 52 43 - ( x - 2 ) = 52
17 + x = 20 5.4 + x + 3 = 25 8 + x + 3 = 25 64 - x + 2 = 25
x = 20 - 17 20 + 3 + x = 25 11 + x = 25 66 - x = 25
x = 3 23 + x = 25 x = 25 - 11 x = 66 - 25
x = 25 - 23 x = 14 x = 41
x = 2
Đăng nhìu v bn :) Đáng quan ngại đây :)
Câu 1:
\(13\cdot17-256:16+14:7-1\)
\(=221-16+2-1\)
\(=206\)
Câu 2:
\(2^7:2^2+5^4:5^3\cdot2^4-3\cdot25\)
\(=2^{7-2}+5^{4-3}\cdot16-75\)
\(=2^5+5\cdot16-75\)
\(=32+80-75=37\)