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*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
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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