(90:15)^2+x=(2^3)^2-2^2.7
Jup nha các anh em :
1 Tìm x
\(\left(90:18\right)^2+x\left(2^3\right)^{12}-2^2.7\)
\(2^{x.1}+3^3-5^2+2.3\)
Dấu " . " là nhân nha
1 Tìm x
\(\left(90:18\right)^2+x.\left(2^3\right)^{12}-2^2.7\)
\(2^{x.1}+3^3-5^2+2.3\)
Ai nhanh mk tick cho
nhanh nha ko mk :L mất
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tim x biet
a) 3.2\(^{^{ }x}\)- 3 = 45
b) ( 2 \(^x\)+ 1 )\(^3\)= 125
c ) ( 90 : 15 )\(^2\)+ x = 2\(^6\)- 2 \(^{2.7}\)
d) 1990\(^0\)+ ( x - 15 )= 3\(^{199}\): 3 \(^{196}\)- 1 \(^{2000}\)
em cần gấp 5 giờ em đi học rồi
d)19900+(x-15)=3199:3196-12000
1+(x-15)=26
x-15=26-1=25
x=25+15=40
c) (90:15)2+x=26-22.7
36+x=-16320
x=-16320-36=-16356
b) (2x+1)3=125
(2x+1)3=53
2x+1=5
2x=5-1=4=22
x=2
a) ko hiểu đề bài
a) \(3.2^x-3=45\)
\(3\left(2^x-1\right)=45\)
\(2^x-1=15\)
\(2^x=15+1\)
\(2^x=16\)
\(2^x=2^4\)
=>x=4
b) \(\left(2^x+1\right)^3=125\)
\(\left(2^x+1\right)^3=5^3\)
=> \(2^x+1=5\)
Làm tương tự câu a, đc x = 2
c) \(\left(90:15\right)^2+x=2^6-2^{2.7}\)
\(6^2+x=64-16384\)
\(x=-16320-36\)
x=-16356
d) \(1990^0+\left(x-15\right)=3^{199}:3^{196}-1^{2000}\)
1 + x - 15 = 33-1
x= 27-1-1+15
x=40
bai1
a) 5X-2-32=24-( 28 .24-210.22) =
b)697 :[ ( 15 .x+ 64) :x]=17
c) 134: ( x-3 )= 35+ 160:5
d) ( 3. x - 24) .73-2.74
e) [(10-x).2-5 ] : 3-2=3
a) 5X-2-32=24-( 28 .24-210.22)
5X-2-9=16-( 28+4-210+2)
5X-2-9=16-( 212-212)
5X-2-9=16-0
5X-2-9=16
5X-2=16+9
5X-2=25
5X-2=52
=>x-2=2
x=2+2
x=4
b)697 :[ ( 15 .x+ 64) :x]=17
k biết
c) 134: ( x-3 )= 35+ 160:5
134: ( x-3 )= 35+32
134: ( x-3 )= 67
x-3=134:67
x-3=2
x=2+3
x=5
d) ( 3. x - 24) .73-2.74
đề thiếu
e) [(10-x).2-5 ] : 3-2=3
[(10-x).2-5 ] : 3=3+2
[(10-x).2-5 ] : 3=5
(10-x).2-5=5x3
(10-x).2-5=15
(10-x).2=15+5
(10-x).2=20
10-x=20:2
10-x=10
x=10-10
x=0
Dãy số có 2 chữ số chia hết cho 3 là:[12,15,....,99]
Khoảng cách của từng số hạng là 3
Số số hạng là: (99-12):3+1=30(số)
Vậy có 30 số có 2 chữ số chia hết cho 3
Quy đồng mẫu số các phân số sau: a) 8/2^3.25 và 10/2^2.5^2.7
b) 6^2-8/-12+4^2 và 15-3^4/-27+3^2
a) \(\frac{8}{2^3.25}=\frac{8}{8.25}=\frac{1}{25}\)
\(\frac{10}{2^2.5^2.7}=\frac{100}{10^2.7}=\frac{1}{70}\)
Mẫu chung của 2 phân số là 350
giup minh voi cac ban :
1timx
5^x-2-3^2=2^4-(2^8.2^4-2^10.2^2)
697:[(15^x+364):x]=17
134:(x-3)=35+160:5
(3.x-2^4).7^3=2.7^4
[(10-x) .2+5]:3-2=3
2 tim x thuoc N
cau a : n+5chia het n +1
cau b :2.n +7 chia het cho n-2
Lúc bạn hỏi, bạn đang bằng tuổi tôi đấy. Còn giờ...
Thực hiện phép tính:
a) 3/2.7/2+5/3.1/2
b) 1/9.2/145-13/3.2/145+2/145
c) (-91/12):15/7-1/18:15/7+20/9:15/7)
a) \(\frac{3}{2}.\frac{7}{2}+\frac{5}{3}.\frac{1}{2}=\frac{21}{2}+\frac{5}{6}=\frac{63}{6}+\frac{5}{6}=\frac{68}{6}=\frac{34}{3}\)
b) \(\frac{1}{9}.\frac{2}{145}-\frac{13}{3}.\frac{2}{145}+\frac{2}{145}=\frac{2}{145}\left(\frac{1}{9}-\frac{39}{9}+\frac{9}{9}\right)=\frac{2}{145}\left(-29\right)=-0.4\)
c) \(\left(-\frac{91}{12}\right):\frac{15}{7}-\frac{1}{18}:\frac{15}{7}+\frac{20}{9}:\frac{15}{7}=\frac{7}{15}\left(-\frac{91}{12}-\frac{1}{18}+\frac{20}{9}\right)=\frac{7}{15}\left(-\frac{65}{12}\right)=-\frac{91}{36}\)
tim x biet
X+35=-22-X
(6X-4^2) .7^8=2.7^9
5.3^x-1-7.3^12=8.3^12
3.(x-15)^3=-24
lx+18l=10
tìm x
(3x-24).714=2.715
(3x-24).714=2.715
=>3x-16=2.715:714
=>3x-16=2.7
=>3x=16+14
=>x=30:3
=>x=10
Vậy x=10