(-12)^2 . x=56+13.10x
Tìm số tự nhiên x biết:
a) 5 6 + 1 6 ≤ x ≤ 13 4 + 14 8
b) − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2
a) 5 6 + 1 6 ≤ x ≤ 13 4 + 14 8 ⇔ 1 ≤ x ≤ 5 ⇒ x ∈ 1 ; 2 ; 3 ; 4 ; 5
b) − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2 ⇔ − 3 ≤ x ≤ 4
Vì x là số tự nhiên nên x ∈ 0 ; 1 ; 2 ; 3 ; 4
Tìm x ∈ ℕ , biết:
a ) 5 6 + 1 6 ≤ x ≤ 13 4 + 14 8 b ) − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2 c ) 79 15 + 7 5 + − 8 3 ≤ x ≤ 10 3 + 15 4 + 23 12
a) 1 ≤ x ≤ 5 => x ∈ {1;2;3;4;5}
b) -3 ≤ x ≤ 4 =>x ∈ {0;1;2;3;4}
c) 4 ≤ x ≤ 9 => x ∈ {4;5;6;7;8;9}
Tìm x thuộc N, biết:
a ) 5 6 + 1 6 ≤ x ≤ 13 4 + 14 8 b ) − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2 c ) 79 15 + 7 5 + − 8 3 ≤ x ≤ 10 3 + 15 4 + 23 12
2 x( X +56 )-13 =(65 x 12)
2 x ( X + 56 ) - 13 = 780
2 x ( X + 56 ) = 793
X + 56 = 396,5
X = 340,5
\(2.\left(x+56\right)-13=65.12\)
\(2.\left(x+56\right)-13=780\)
\(2.\left(x+56\right)=780+13\)
\(2.\left(x+56\right)=793\)
\(\left(x+56\right)=793:2\)
\(x+56=396,5\)
\(x=396,5-56\)
\(x=340,5\)
Vậy \(x=340,5\)
(x^2+7x+12)(x^2-15x+56)=180
(-12)^2.x=56-[(-10).13.x]
Tìm x thuộc Z, biết:
a) 5 6 + 1 6 ≤ x ≤ 13 4 + 14 8
b) − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2
c) 79 15 + 7 5 + − 8 3 ≤ x ≤ 10 3 + 15 4 + 23 12
a) 5 6 + 1 6 ≤ x ≤ 13 4 + 14 8 ⇔ 1 ≤ x ≤ 5 ⇔ x ∈ 1 ; 2 ; 3 ; 4 ; 5
b) − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2 ⇔ − 3 ≤ x ≤ 4 ⇔ x ∈ − 3 ; − 2 ; − 1 ; 0 ; 1 ; 2 ; 3 ; 4
c) 79 15 + 7 5 + − 8 3 ≤ x ≤ 10 3 + 15 4 + 23 12 ⇔ 4 ≤ x ≤ 9 ⇔ x ∈ 4 ; 5 ; 6 ; 7 ; 8 ; 9
Tìm số nguyên x, biết: (-12)2.x = 56 + 10.13.x
(-12)2.x = 56 + 10.13.x
144.x = 56 + 130.x
144x – 130 x = 56
14x = 56
x = 56: 14
x = 4
Vậy x = 4
Tính nhanh :
a) 12 x 56 + 12 x 44
b) 45 x 12 - 45 x 2 + 45 x 90
A 12x56 + 12x44 =44+56=100
100X56=5600
b 45x12-45x2+45x90=90+2-12=80
80x45=3600
a) 12 x 56 + 12 x 44
=12.(56+44)
=12.100
=1200
b) 45 x 12 - 45 x 2 + 45 x 90
=45.(12-2+90)
=45.100
=4500
a)12x56+12x44
=12(56+44)
=12x100
=1200
b)45x12-45x2+45x90
=45(12-2+90)
=45x100
=4500