豆豆

中華民國公民🇹🇼

[豆豆 @m9002223]

@farman4x Utilize (a + b)^2 = a^2 + 2ab + b^2

y × y + y = 20
=〉y^2 + 2 × y × 1/2 + (1/2)^2 = 20 + (1/2)^2
=〉(y + 1/2)^2 = (20 × 4 + 1)/4
=〉(y + 1/2)^2 = 81/4
=〉y = (81/4)^(1/2) - 1/2
= +-(9/2) - 1/2
= 4 or -5

[豆豆 @m9002223]

@usludurkizim 14

[豆豆 @m9002223]

@tekboylz (9, 4) ---> 41 = 9 × 4 + (9 - 4)
(8, 3) ---> 29 = 8 × 3 + (8 - 3)
f
(x, y) ---> z = f(x, y) = x × y + (x - y)
(7, 5) ---> ? = 7 × 5 + (7 - 5) = 37

[豆豆 @m9002223]

@NatureWorld44 3 + 5 = 24 = (3 + 5) × 3
4 + 6 = 40 = (4 + 6) × 4
5 + 7 = 60 = (5 + 7) × 5
9 + 7 = ?? = (9 + 7) × 9
=> ?? = 16 × 9 = 144

[豆豆 @m9002223]

@_Aria_2210 (a^2 + a) / 6 = a
=> a^2 / a = (6a - a) / a
=> a = 5

[豆豆 @m9002223]

@EllaJeanrz b^2 / 5 = 20
=> b = ±√(20 × 5)
=> b = ±√100
=> b = ±10

[豆豆 @m9002223]

@usludurkizim (1) 9 × 4 + (9 - 4) = 36 + 5 = 41
(2) 8 × 3 + (8 - 3) = 24 + 5 = 29
(3) 7 × 5 + (7 - 5) = 35 + 2 = 37

[豆豆 @m9002223]

@Marryjing173531 憑空想像

[豆豆 @m9002223]

@mathsrick_ 3^y = 1/27
=> 3^y = 3^(-3)
=> y = -3

[豆豆 @m9002223]

@MustafaCharts 7/21 = x/36
=> x = (7/21) × 36 = 12

[豆豆 @m9002223]

@quizmasterx5 (a/b + b/a)^2
= (a/b)^2 + 2(a/b)(b/a) + (b/a)^2
= (a/b)^2 + 2 + (b/a)^2
= 167 + 2
= 169
=> √((a/b + b/a)^2) = ±√(169)
=> a/b + b/a = ±13

[豆豆 @m9002223]

@Pennnyyog 4^n = 64
=> log_4(4^n) = log_4(4^3)
=> n = 3

[豆豆 @m9002223]

@faiza_566 6m^2 = 150
=> m = ±√(150/6) = ±5
=> (m - 5)^2 = (±5 - 5)^2 = 0 or 100

[豆豆 @m9002223]

@quizmasterx5 x^2 = 16
xy = 48
=> (xy)^2 = 48^2
=> x^2 × y^2 = 48^2
=> 16y^2 = 48^2
=> y^2 = 48^2 / 16 = 144

[豆豆 @m9002223]

@quizmasterx5 5y^2 = 80
=> y = ±√(80/5)
=> y = ±4
=> y + 4 = ±4 + 4 = 8 or 0

[豆豆 @m9002223]

@Simi_2210_ a + a × a = 20
=> a^2 + a = 20
=> a^2 + 2(1/2)a = 20
=> a^2 + 2(1/2)a + (1/2)^2 = 20 + (1/2)^2
=> (a + 1/2)^2 = 81/4
=> √((a + 1/2)^2) = ±√(81/4)
=> a + 1/2 = ±(9/2)
=> a = ±(9/2) - 1/2
=> a = 4 or -5

[豆豆 @m9002223]

@Puzzlesonly Row 1 = [5 7 2] => 5 + 2 = 7
Row 2 = [8 11 3] => 8 + 3 = 11
Row 3 = [13 17 ?]
=> 13 + ? = 17
=> ? = 17 - 13 = 4

[豆豆 @m9002223]

@IfearonlyNature 4√(x) = x√(4)
=> (4√(x))^2 = (x√(4))^2
=> 16x = 4x^2
=> 16/4 = (x^2)/x
=> x = 4

[豆豆 @m9002223]

@miaElizai 60 ÷ (1/6) × 2
= (60/1) / (1/6) × 2
= (60 × 6) / (1 × 1) × 2
= 360 / 1 × 2
= 720

[豆豆 @m9002223]

@Arden_2210 x/2 = 8/x
=> x^2 = 8 × 2
=> x^2 = 16
=> √(x^2) = ±√(16)
=> x = ±4