*Hoàn thành các PTHH sau:

\(Fe+HNO_3->Fe\left(NO_3\right)_3+NO+H_2O\)
\(Fe+H_2SO_4->Fe_2\left(SO_4\right)_3+SO_2+H_2O\)
\(Al+HNO_3->Al\left(NO_3\right)_3+N_2O+H_2O\)

1230347215615998218 

!

mot hinh chu nhat co dien h bang 5/8 m2,co chieu dai bang 5/4 m.tinh chu vi cua hinh chu nhat do?

trò đua xe đạp

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140kg=0,14

B vì 2x5=10 có 1 chữ số 0 và số 10 có 1 chữ số 0=>có 2 chữ số

nội dung vớ vẩn . 

Phân số chỉ số tuổi học sinh nam và học sinh nữ là:

1/4+1/5 = 9/20 

Tuổi của mẹ là

18: 9/20 = 40 (tuổi)

Đáp số: 40 tuổi

Nhớ cho một L-I-k-E nha !

Để đa thức sau có nghĩa thì \(xy-3y\ne0\Rightarrow y\left(x-3\right)\ne0\Rightarrow y\ne0\) hoặc \(x-3\ne0\)

\(\left(+\right)y\ne0\)

\(\left(+\right)x-3\ne0\Rightarrow x\ne3\)

Vậy \(x\ne3;y\ne0\) thì đa thức trên có nghĩa