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a) 20 : 2 2 − 5 9 : 5 8 = 5 − 5 = 0
b) ( 5 19 : 5 17 − 4 ) : 7 0 = ( 5 2 − 4 ) : 1 = 21
c) 295 − ( 31 − 2 2 .5 ) 2 = 295 − 11 2 = 174
\(a)\) \(5^{13}:5^{10}-25.2^2=5^3-25.4=125-100=25\)
\(b)\) \(20:2^2+5^9:5^8=20:4+5^1=5+5=10\)
\(c)\) \(100:5^2+7.3^2=100:25+7.9=4+36=40\)
\(d)\) \(84:4+3^9:3^7+5^0=84:4+3^2+1=21+9+1=31\)
\(e)\)
\(29-\left[16+3.\left(51-49\right)\right]=29-\left[16+3.2\right]=29-\left[16+6\right]=29-22=7\)
\(f)\) \(5.2^2+98:7^2=5.4+98:49=20+2=22\)
\(g)\) \(3^{11}:3^9-147:7^2=3^2-147:49=9-3=6\)
\(295-\left(31-2^2.5\right)^2=295-\left(31-4.5\right)^2=295-\left(31-20\right)^2=295-11^2=295-121=174\)
\(7^{18}:7^{16}+2^2.3^2=7^2+4.9=49+36=85\)
a: \(5^{13}:5^{10}-25\cdot2^2\)
\(=5^3-25\cdot4\)
=125-100
=25
b: \(20:2^2+5^9:5^8\)
\(=20:4+5\)
=5+5
=10
[295+(-216)-[-295+(-100) -(295+ (-116)]
= 76 - (-395) - 179
= 292
muấn làm nhanh hon thì bảo mình nha mình on 12/24
115 + 3 . ( x - 2 ) = 295
3 . ( x - 2 ) = 295 - 115
3 . ( x - 2 ) = 180
x - 2 = 180 : 3
x - 2 = 60
x = 60 + 2
x = 62
16 : 2 . x = 9
x = ko tính được
20 - ( x +14 ) = 5
x + 14 = 20 - 5
x + 14 = 15
x = 15 - 14
x = 11
57 : ( 9 . x - 27 ) = 0
vì số nào chia 0 thì bằng 0 mà 27 : 9 = 3 nên
x = 3
Tìm x:
115+3.(x-2)= 295 16:2.x= 9 20-(x+14)=5 57:(9x-27)=0
3.(x-2)= 295-115 2.x= 16:9 x+14= 20-5 9x-27= 0
3.(x-2)= 180 2.x= 16/9. x+14= 15. 9x= 27
x-2= 180:3 x= \(\frac{16}{9}:2\) x= 15-14 x= 27:9
x-2= 60 \(x=\frac{16}{9}.\frac{1}{2}\) x= 1 x= 3
x= 60+2 \(x=\frac{8}{9}\)
x= 62
a) 58.75+58.50-58.25
=58.(75+50-25)
=58.100
=5800
b) \(20:2^2-5^9:5^8\)
\(20:4-5\)
\(5-5=0\)
c)\(\left(5^{19}:5^{17}-4\right):7\)
\(\left(5^2-4\right):7\)
\(\left(25-4\right):7\)
\(21:7\)
=\(3\)
d) \(84:4+3^9:3^7+5^0\)
\(=21+3^2+1\)
\(=21+9+1\)
\(30+1=31\)
e) \(295-\left(31-2^2.5\right)^2\)
\(295-\left(31-4.5\right)^2\)
\(295-\left(31-20\right)^2\)
\(295-\left(11\right)^2\)
\(295-121\)
\(=174\)
f) \(11^{25}:11^{23}-3^5:\left(1^{10}\right)+2^3-60\)
\(11^2-243:1+8-60\)
\(121-243+8-60\)
\(-122+8-60\)
\(-114-60\)
\(=-174\)
a. 75+58.50 - 58.25
= 78 + 58 . ( 50 - 25)
= 78 + 58 . 25
= 78 + 1450
= 1528
b. 20 : 2² - 5⁹ : 5⁸
= 20 : 4 - 5
= 5 - 5
= 0
c. (5¹⁹ :5¹⁷ - 4 ):7
= ( 52 -4 ) : 7
= (25 - 4 ) : 7
= 21 : 7
= 3
d. 84:4 +3⁹:3⁷
= 21 + 32
= 21 + 9
= 30
e. 295 - ( 31 - 2².5 )²
= 295 - ( 31 - 4 . 5 )2
= 295 - ( 31 - 20)2
=295 - 11 2
= 295 - 121
=174
295 –[245-(195-245)]
=295-245-195+245
=(295-195)+(245-245)
=100+0=100
\(20+\left(-295\right)=-\left(295-20\right)=-275\)
bấm máy tính là ra:)