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17 tháng 3 2018

Đáp án D

Tế bào AAaa giảm phân có thể xảy ra các trường hợp sau:

TH1: 100%Aa

TH2: 50%AA : 50%aa.

Nếu cả 3 tế bào đều giảm phân theo TH1 thì tạo ra 100% Aa. Nội dung 1 đúng.

Nếu cả 3 tế bào đều giảm phân theo TH2 thì tạo ra 50%AA : 50%aa. Nội dung 3 đúng

Nếu 2 tế bào giảm phân theo TH1, tế bào còn lại giảm phân theo TH2 thì tạo ra: 8Aa : 2AA : 2aa = 4Aa : 1AA : 1aa. Nội dung 4 đúng.

Nếu 2 tế bào giảm phân theo TH2, tế bào còn lại giảm phân theo TH1 thì tạo ra 4AA : 4aa : 4Aa = 1 AA : 1aa : 1Aa.  Nội dung 2 đúng

Vậy có 4 nội dung đúng.

21 tháng 8 2019

Đáp án C

Tế bào AAaa giảm phân có thể xảy ra các trường hợp sau:

TH1: 100%Aa

TH2: 50%AA : 50%aa.

Nếu cả 3 tế bào đều giảm phân theo TH1 thì tạo ra 100% Aa. Nội dung 1 đúng.

Nếu cả 3 tế bào đều giảm phân theo TH2 thì tạo ra 50%AA : 50%aa. Nội dung 3 đúng

Nếu 2 tế bào giảm phân theo TH1, tế bào còn lại giảm phân theo TH2 thì tạo ra: 8Aa : 2AA : 2aa = 4Aa : 1AA : 1aa. Nội dung 4 đúng.

Nếu 2 tế bào giảm phân theo TH2, tế bào còn lại giảm phân theo TH1 thì tạo ra 4AA : 4aa : 4Aa = 1 AA : 1aa : 1Aa.  Nội dung 2 đúng

Vậy có 4 nội dung đúng.

27 tháng 8 2021

Xét tam giác ABC và tam giác NCB  lần lượt vuông tại A và N có

BC chung

\(\widehat{NBC}=\widehat{ACB}\)(tam giác ABC cân tại A)

=> ΔABC=ΔNCB(ch-gn)

=> AB=CN

 

27 tháng 8 2021

ch-gn là gì vậy

 

18 tháng 10 2015

vào câu hỏi tương tự nha bạn

20 tháng 2 2019
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6 tháng 6 2016

a>2;b>2 => ab>2a

a>2;b>2=>ab>2b

=>2ab> 2(a+b)=>ab>a+b

2 tháng 6 2016

bên ab, ta có :

ab = ao + b

     = a x 10 + b = a + a + a + a + a + a + a + a + a + a + b

bên a + b, ta có

a + b(giữ nguyên)

So sánh:

a + a + a + a + a + a + a + a + a + a + b(ab) > a + b

Vậy, ab > a+ b