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saw5 [17]
3 years ago
11

Bài 4: 350 Cho tam giác ABC nhọn, hai đường cao BD, CE cắt nhau tại H. M là trung điểm của BC. K đối xứng với H qua M. a) Chứng

minh tứ giác BHCKlà hình bình hành b) Chứng minh BK LAB và CK AC. c) Gọi 0 là trung điểm của AK. Chứng minh OM IBC d) Gọi N là điểm đối xứng với H qua BC. Chứng minh BNKC là hình thang cần​
Mathematics
1 answer:
Dima020 [189]3 years ago
5 0
No sabo la respuesta jajaja
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What is the value of x in the equation 4x + 8y = 40, when y = 0.8?
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4x + (8)(0.8) = 40
Now solve for x
====================================================================
SOLVING...

<span>4x + (8)(0.8) = 40
</span><span>4x + 6.4 </span>= <span>40
</span>
Subtract 6.4 from each side
<span><span><span>4x</span>+ 6.4 </span>− 6.4 </span>= <span>40 − <span>6.4
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Divide each side by 4
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x = 12

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For any clarification, Please contact me in the comment section :)

I Hope It Helps .

Step-by-step explanation:

Let -the-unkonown- numbers-be-x-and-y \\x-y = 1       (1)\\xy = 132    (2)\\Make-x-subject-of-formula-in-equation1 \\x = 1+y\\Substitute , 1+y  for- x -in -equation ,2\\y(1+y) = 132\\y + y^{2} =132\\y^{2} +y-132=0\\Solve- the-quadratic-equation.\\y = 11\\substitute- 11 -for- y- in- equation -1- 0r- 2\\x -y = 1\\x-11 = 1\\x = 1+11\\x = 12

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