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Giải thích hiện tượng thêm muối vào khi luộc rau để rau xanh

1/cho biểu thức A= 3/n-2 với n là số nguyên.khi nào A ko phải là phân số 2/Trong đẳng thức 5/x = -18/72 , x có giá trị là bao nhiêu

1.Dựa vào đồ thị của hàm số y=sinx, hãy vẽ đồ thị của hàm số y= \sinx/ 2. Chứng minh rằng sin 2(x+kpi)= sin 2x với mọi số nguyên k. Từ đó vẽ đồ thị hàm số y=sìnx

Mọi người giúp mình với ạ Mình cảm ơn

Cho tam trận biểu mô cấp 5 : $37$ $14$ $23$ $6$ $8$ $15$ $3$ $3$ $5$ $10$ $1$ $2$ $1$ $4$ $6$ $a)$Tính định thức biểu mô $b)$Giả sử tồn tại $mgc-x[A]_5$ nếu khi chuyển hàm thì định thức thay đổi ntn? $c)$Trị max tương đương,từ đó xét toạ độ tương đương khi giá thuận lợi là $5$

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1).... rain cause great harm to the natural environment A. toxic B.Acid C.chemical 2)while he ... in the park, he fell and broke his leg. A.jogged B. is jogging C.was jogging 3)the school rules clearly state that students ... use their cell phone in the classroom. a.don't have to b.might not c.must not 4)i bought this beautiful necklake at a ... store downtown a.stationery b.housewares c.jewelry 5)mary finds horror movies quiets .... a. very scary b.scared c.scary 6)bob's father works as a car ... a.assitant b.cashier c.salesman 7)the dvd store had many comedies yo choose.... a.from b.with c.by 8)you look like you've been crying.is something ...? a.wrong b.well c.all right 9)mike had to wait ... he felt better before he could start going to school again. a.when b.until c. as soon as 10)lois exercises three times a week to keep her ... figure. a.slim b.middle-aged c.cunning 11)your answeres on the test were different ... mine. a.from b.with c.than 12)i haven't been abroad...2004 a.in b.for c.since 13)the fisherman sold all the fish he haf caught in his ... a.ladder b.net c.nest 14.linda received a silver ... for finishing second in the gymnastics competitin. a.licence b.record c.medal 15.the house ... i want to live has an outdoor swimming pool. a.which b.where c.who 16.fortunately,nancy and tom made soon after their fight. a.up with b.up c.in 16.according ... this review,the new thai restaurant has excellent food and service. a.to b.with c.from 17.i ran ... susie at the movie theater last night.she's doing fight. a.out of b.across c.over 18.anything i need is ... at hand, as the grocery srore is next door to my house. a.close b.convenient c.easy 19.i wanted jane to be my ... on the science project. we work well together a.member b.passenger c.partner 20.there is ... fruit in the fridge if you're hungry a.some b. lot of c. any 21.why don't you do your homework instead of just sitting ... doing nothinf ? a.over b.out c.arund 22.there's really... traffic today. i hope we won't be late a.big b.heavy c.high 23.tom always ... flowers for his wife on her birthday a.buying b.buy c.buys