Tìm x
a,2x+2=12+14
b,18+3x=12.3
a,2x+2=12+14
2x+2=26
2x=26-2
2x=24
x=24:2
x=12
Vậy x=12
b,18+3x=12.3
18+3x=36
3x=36-18
3x=18
x=18:3
x=6
Vậy x=6
a, 2x+2=12+14
<=> 2x=12+14-2=24
<=> x=24/2=12
b, 18+3x=12.3
<=> 3x=12.3-18=18
<=> x=18/3=6
m sai chỗ nào ai chỉ hộ với
1)
a)12.32-23.(20150+13)
b)175-[(32-23).5-15]:3
c)18.37+18.64+18
Mìk xin lỗi nha, câu a sai rùi, làm lại cho:
a) \(12.3^2-2^3.\left(2015^0+1^3\right)=12.9-8.\left(1+1\right)\)
\(=12.9-8.2=108-16=92\)
OK rùi đấy, tick nha thank you trước
C1.thực hiện phép tính sau :
a,12-[25+(6+3)^2]
b,315-(8^6 : 8^4 - 12.3+7+7^3)
c, -81-(108)
d, -13-91
e,-85-(-17)
g, 63 . (-8)+(-63).92
h, (-18).9-9.18
HELPPPPPPPP♤♤♤♤
a)\(12-\left[25+\left(6+3\right)^2\right]\)
\(=12-\left[25+9^2\right]\)
\(=12-\left[25+81\right]\)
\(=12-106\)
\(=\left(-94\right)\)
b) \(315-\left(8^6\div8^4-12.3+7+7^3\right)\)
\(=316-\left(8^2-36+7+343\right)\)
\(=316-\left(64-43+343\right)\)
\(=316-\left(21+343\right)\)
\(=316-364\)
\(=\left(-48\right)\)
c) \(-81-108\)
\(=-\left(81+108\right)\)
\(=\left(-189\right)\)
d) \(-13-91\)
\(=-\left(13+91\right)\)
\(=\left(-104\right)\)
e)\(-85-\left(-17\right)\)
\(=-85+17\)
\(=-\left(85-17\right)\)
\(=\left(-68\right)\)
g) \(63.\left(-8\right)+\left(-63\right).92\)
\(=63.\left(-8\right)+63.\left(-92\right)\)
\(=63.\left[\left(-8\right)+\left(-92\right)\right]\)
\(=63.\left(-100\right)\)
\(=\left(-6300\right)\)
tính tổng:
A=1.3+3.5+5.7+...+(2n-1)(2n+1)
tính
B= 2^12.3^5-2^12.3^4/2^12.3^6+2^12.3^5 - 5^10.7^3-5^10.7^4/5^9.7^3-5^9.7^3.2^3
Ai giúp mình vs càng nhanh càng tốt nha!!!
a) 1200 : 2 + 62.21 + 18
b) 59 : 57 + 70 : 14 – 20
c) 32.5 – 22.7 + 83
d) 59 : 57 + 12.3 + 70
e) 151 – 291 : 288 + 12.3
\(a,=600+72+18=690\\ b,=25+5-20=10\\ c,=45-28+83=100\\ d,=25+36+1=62\\ e,=151-8+3=146\)
a)600+72+18=690
b)25+5-20=10
c)45-28+83=100
d)25+36+1=62
e)151-8+3=146
a: =600+72+18
=690
b: =25+5-20
=10
c: =45-28+83
=100
Tinh nhanh :
M= 16.2*3.7*5.7*16.2-7.8*4.8-4.6*7.8/11,2+12.3+13.4-12.6-115-10.4
N=4.29*12330-4.29*2.3/30-15+36-18++422-21+.....+96-48+102-51
tính nhanh
a) ( 51.43-49.43):43
b) (2^5.3+2^5.5):2^6
c) 2^13.3+2^12.3^2 phần 2^12.3
a) (51 . 43 - 49 . 43) : 43
= (51 - 49) . 43 : 43
= 2
a)
<=> (51.43) - (49.43) chia hết cho 43
<=> 51.43 chia hết cho 43 - 49.43 chia hết cho 43 => (51.43 - 49.43) chia hết cho 43
gửi đến bạn vũ thu trang
4^6x9^5+6^9x120/8^4x3^12-6^11
= (2^2)^6.(3^2)^5 + (2.3)^9.3.5.2^3 / (2^3)^4.3^12 - (2.3)^11
= 2^12.3^10 + 2^9.3^9.3.5.2^3 / 2^12.3^12 - 2^11.3^11
= 2^12.3^10 + 2^12.3^10.5 / 2^11.2. 3^11.3 - 2^11.3^11
= 2^12.3^10.(1+5) / 2^11.3^11.(6-1)
= 2^12.3^10.6 / 2^11.3^11.5
= 4/5
Nhiwf bạn nên mình làm được bài này ! Hihi
Tính nhanh: A = 1 1.2 + 1 2.3 + ... + 1 2017.2018
Tính: A = 1 1.2 + 1 2.3 + 1 3.4 + ... + 1 2017.2018
