2^4×4×32/(-2)^2×2^5 help
1,4 x 15/49 - (4/5 + 2/3) : 2 1/5
tìm X:
(2,8x - 32) : 2/3 + -90
help me, please !!!!!~
a: \(=\dfrac{7}{5}\cdot\dfrac{15}{49}-\dfrac{12+10}{15}:\dfrac{11}{5}\)
\(=\dfrac{3}{7}-\dfrac{22}{15}\cdot\dfrac{5}{11}=\dfrac{3}{7}-\dfrac{2}{3}=\dfrac{9-14}{21}=\dfrac{-5}{21}\)
b: =>2,8x-32=-60
=>2,8x=-28
hay x=-10
1. 4 + x = 7 - 2x
2. 5 + x = 8,3 + 4,7 - x
3. x + 12 = 35 + ½x
4. 6 + x = 7⅓ + 2 - x
5. 20x + 4 = 19,2 + 15x
6. x + 5 = 8 2/5 - 4x
7. 3 (x +1) = 13,5
8. 32 - (32 - x) = 32
9. 5x - 12 3/5 = 0
10. x - 10/3 = 0
P/s : Please, help me 😋😋
4 + x = 7 - 2x
4 + x + 2x = 7
4 + 3x = 7
3x = 7 - 4
3x = 3
x = 3 : 3
x =1
5 + x = 8,3 + 4,7 - x
5 + x + x = 8,3 + 4,7
5 + 2x = 13
2x = 13 - 5
2x = 8
x = 8 : 2
x= 4
2. Đặt tính rồi tính :
a ) 24 : 6 30 : 5 15 : 3 20 : 4
b) 32 : 5 34 : 6 20 : 3 27 : 4
Help me Ngày mai em nộp rồi
a) 24 : 6= 4 30 : 5= 6 15: 3=5 20 : 4= 5
b) 32 :5= 6 ?( dư 4) còn lại em tính đi nhé!!
a) 24 : 6= 4 30 : 5= 6 15: 3=5 20 : 4= 5
b) 32 :5= 6 ?( dư 4)
Help me a)4X=5Y=32 va 4y=32 ,x-y+z=36 ; b)x-1/2=y-2=3-z/3 và x+y+z=12 c) x/9=y/2=z/-2 và xyz=4
1. cho a-b=1
c/m (a+b).(a^2+b^2).(a^4+b^4)...(a^16+b^16)=a^32-b^32
2.CMR: neeus (x^2+y^2+z^2).(a^2+b^2+c^2)=(ax+by+cz)^2 thì x/a=y/b=z/c
help me giúp đc câu nào cx đc
Bài 1:
\(VT=1\cdot\left(a+b\right)\left(a^2+b^2\right)\left(a^4+b^4\right)\left(a^8+b^8\right)\left(a^{16}+b^{16}\right)\)
\(=\left(a-b\right)\left(a+b\right)\left(a^2+b^2\right)\cdot\left(a^4+b^4\right)\left(a^8+b^8\right)\left(a^{16}+b^{16}\right)\)
\(=\left(a^2-b^2\right)\left(a^2+b^2\right)\left(a^4+b^4\right)\left(a^8+b^8\right)\left(a^{16}+b^{16}\right)\)
\(=\left(a^4-b^4\right)\left(a^4+b^4\right)\left(a^8+b^8\right)\left(a^{16}+b^{16}\right)\)
\(=a^{32}-b^{32}\)
Tính hợp lý :
a, 32 . ( -19 ) + ( -32 ) . 81
b, 100 - 520 - ( -1440+620 )
c, - 4 . ( -5 )2 - 2 . | -5 | + 16
HELP
a, 32 . ( -19 ) + ( -32 ) . 81
= 32 . ( -19 ) + 32 . ( -81 )
= 32 . [ -19 + ( -81 ) ]
= 32 . ( -100 )
= -3200
b, 100 - 520 - ( -1440+620 )
= 100 - 520 - ( -820 )
= -420 + 820
= 400
c, - 4 . ( -5 )2 - 2 . | -5 | + 16
= - 4 . 25 - 2 . 5 + 16
= -100 - 10 + 16
= -110 + 16
= -94
Đúng ghi Đ, sai ghi S:
a) (32 + 128) : 4 = 32 : 4 + 128 : 4 = 8 + 32 = 40
b) 240 : (2 + 5) = 240 : 2 + 240 : 5 = 120 + 48 = 168
Hướng dẫn giải:
a) (32 + 128) : 4 = 32 : 4 + 128 : 4 = 8 + 32 = 40
b) 240 : (2 + 5) = 240 : 2 + 240 : 5 = 120 + 48 = 168
1) Thuc hien phep tinh:
a) 4^6 × 9^2 / 6^3 × 8^2
b) 5^6 × 15^4 /5^4 × 3^3
c) 3^9 - 2^3 × 3^7 + 2^10 × 3^2 - 2^13 / 3^10 - 2^2 × 3^7 + 2^10 × 3^3 - 2^12
d) (1/9)^10 : (1/3)^20
e) (1/64)^5 × (1/4)^7
2) Chung minh rang:
a)2014^100+2014^99 chia het cho 2015
b) 4^13+32^5-8^8 chia het cho 5
c) 81^27-27^9-9^13 chia het cho 405
Help me!! Pleass!!
Tính nhẩm
a) 2 x 6 = ...... 3 x 7 = ......
12 : 2 = ...... 21 : 3 = ......
12 : 6 = ...... 21 : 7 = ......
4 x 8 = ...... 5 x 9 = ......
32 : 4 = ...... 45 : 5 = ......
32 : 8 = ...... 45 : 9 = ......
b) 600 : 3 = ...... 800 : 4 = ...... 400 : 2 = ......
600 : 2 = ...... 800 : 2 = ...... 500 : 5 = ......
) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
Tính nhẩm
a)2×6=12 3×7=21
12:2=6 21:3=7
12: 6=2 21:7=3
4×8=32 5×8=45
32:4=8 45:5=9
32:8=4 45:9=5
b)600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100