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a) $3^8:3^6=3^{8-6}=3^2$
$19^7:19^3=19^{7-3}=19^4$
$2^{10}:8^3=2^{10}:(2^3)^3=2^{10}:2^9=2^{10-9}=2^1$
$12^7:6^7=(12:6)^7=2^7$
$27^5:81^3=(3^3)^5:(3^4)^3=3^{15}:3^{12}=3^{15-12}=3^3$
b) $10^6:10=10^{6-1}=10^5$
$5^8:25^2=5^8:(5^2)^2=5^8:5^4=5^{8-4}=5^4$
$4^9:64^2=4^9:(4^3)^2=4^9:4^6=4^{9-6}=4^3$
$2^25:32^4=2^{25}:(2^5)^4=2^{25}:2^{20}=2^{25-20}=2^5$
$18^3:9^3=(18:9)^3=2^3$
\(\cdot3^8:3^6=3^{8-6}=3^2\)
\(\cdot19^7:19^3=19^{7-3}=19^4\)
\(\cdot2^{10}:8^3=2^{10}:\left(2^3\right)^3=2^{10}:2^9=2\)
\(\cdot12^7:6^7=\left(12:6\right)^7=2^7\)
\(\cdot27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3\)
\(\cdot10^6:10=10^{6-1}=10^5\)
\(\cdot5^8:25^2=5^8:\left(5^2\right)^2=5^8:5^4=5^4\)
\(\cdot4^9:64^2=4^9:\left(4^3\right)^2=4^9:4^6=4^3\)
\(2^{25}:32^4=2^{25}:\left(2^5\right)^4=2^{25}:2^{20}=2^5\)
\(18^3:9^3=\left(18:9\right)^3=2^3\)
\(1,2x+3x-4x=\left(-2\right)^3\)
<=>\(x=-8\)
\(2,x-2x=4^2+4^0\)
<=>\(-x=16+1\)
<=>\(-x=17\)
<=>\(x=-17\)
\(3,2^3x-3^2x=|12-21|\)
<=>\(-x=9\)
<=>\(x=-9\)
\(4,x-45=2x+54\)
<=>\(x-2x=54+45\)
<=>\(-x=99\)
<=>\(x=-99\)
\(5,5x-12+23=6^7:6^5\)
<=>\(5x+11=6^2\)
<=>\(5x+11=36\)
<=>\(5x=25\)
<=>\(x=5\)
a,\(\left(77.54-54.75\right):54-3^5:3^3\)
\(=[54.\left(77-75\right)]:54-3^2\)
\(=[54.2]:54-9\)
\(=108:54-9=2-9=-7\)
b,\(|-12|+\left(-23\right)+\left(-15\right)+|-7|+9\)
\(=12+\left(-23\right)+\left(-15\right)+7+9\)
\(=-10\)
c,\(4^2+2^3.\left(168:2^2-6^2\right)\)
\(=16+8.\left(168:4-36\right)\)
\(=24.\left(42-36\right)=24.6=144\)
d,\(-35+17+\left(-45\right)+|-13|\)
\(=\left(-35+-45\right)+\left(17+13\right)\)
\(=-80+30=-50\)
HTDT
sau 58 ,7,50 ,2,-60 là phép tính khác .
mấy b giúp mk nha ?
a) 3^2 . 187 - 87 . 3^2
= 3^2 . ( 187 - 87 )
= 9 . 100
= 900.
b) 4^2 . 19 + 80 . 4^2 + 4^2
= 4^2 . ( 19 + 80 + 1 )
= 16 . 100
= 1600.
c) 73 . 5^2 + 5^2 . 28 - 5^2
= 5^2 . ( 73 + 28 - 1)
= 25 . 100
= 2500
d) 6^2 . 48 + 51 . 6^2 + 36
= 6^2 . 48 + 51 . 6^2 + 6^2
= 6^2 . ( 48 + 51 + 1)
= 36 . 100
= 3600.
e) 113 . 7^2 - 7^2 . 12 - 49
= 113 . 7^2 - 7^2 .12 - 7^2
= 7^2 . ( 113 - 12 - 1 )
= 49 . 100
= 4900.
f) ( 2^3 . 9^4 + 9^3 . 45 ) : ( 9^2 . 10 - 9^2 )
= ( 8 . 3^12 + 3^9 . 3^2 . 5 ) : ( 9^2 . ( 10 - 1 ))
= ( 8 . 3 . 3^11 + 3^11 . 5 ) : ( 9^2 . 9 )
= 3^11 . ( 8 . 3 + 5) : 3^11
= 8 . 3 + 5
= 24 + 5
= 29.
Câu f mik chưa ra cách gọn hơn, bạn thông cảm. :(
a) = 53+4+1 = 58
b) = 65-4 = 6
c) = 32+3+4-7 = 32
d) = x4+2+1 = x7
e) = 812+10+3 = 825
1. \(5^3.5^4.5=5^{3+4+1}=5^8\)
2. \(6^5:\left(6^3.6\right)=6^5:\left(6^{3+1}\right)=6^5:6^4=6^{5-4}=6^1\)
3. \(\left(3^2.3^3.3^4\right):3^7=\left(3^{2+3+4}\right):3^7=3^9:3^7=3^{9-7}=3^2\)
4. \(x^4.x^2.x=x^{4+2+1}=x^7\)
5. \(\left(8^{12}.8^{10}\right).8^3=8^{12+10+3}=8^{25}\)
1) [(52.23-72.2):2].6-7.2
=[(25.8-49.2):2].6-49
=[(200-98):2].6-49
=[102:2].6-49
=51.6-49
=306-49
=257
2)15.(27+18+6)+15.(23+12)
=15.51+15.35
=15.(51+35)
=15.86
=1290
3)(81:33.15):9.(40:8.2)
=(81:27.15):9 .(5.2)
=(3.15):9.10
=45:9.10
=5.10
=50
Kết quả là 0
ko phải là số âm hay số dương
Nhấn đúng cho mk nha!!!!!!!!!!
Có máy tính thì lấy ra màk bấm, cần gì phải đăng câu hỏi lên