Nội dung bài giảng
1.Tính nhẩm :
a)
\(0 \times 2 = ....\) \(0 \times 5 = ....\) \(3 \times 0 = ....\)
\(1 \times 0 = ....\) \(2 \times 0 = ....\) \(5 \times 0 = ....\)
\(0 \times 3 = ....\) \(0 \times 1 = ....\)
b)
\(0:5 = ....\) \(0:4 = ....\) \(0:3 = ....\)
\(0:1 = ....\)
2.Số ?
3.Tính :
a)
\(\eqalign{ & 4:4 \times 0 = .............. \cr & {\rm{ = }}............... \cr} \) \(\eqalign{ & 8:2 \times 0 = .............. \cr & {\rm{ = }}............... \cr} \) \(\eqalign{ & 3 \times 0:2 = .............. \cr & {\rm{ = }}............... \cr} \)
b)
\(\eqalign{ & 0:5 \times 5 = .............. \cr & {\rm{ = }}............... \cr} \) \(\eqalign{ & 0:2 \times 1 = .............. \cr & {\rm{ = }}............... \cr} \) \(\eqalign{ & 0 \times 6:3 = .............. \cr & {\rm{ = }}............... \cr} \)
Giải
1.Tính nhẩm :
a)
\(0 \times 2 = 0\) \(0 \times 5 = 0\) \(3 \times 0 = 0\)
\(1 \times 0 = 0\) \(2 \times 0 = 0\) \(5 \times 0 = 0\)
\(0 \times 3 = 0\) \(0 \times 1 = 0\)
b)
\(0:5 = 0\) \(0:4 = 0\) \(0:3 = 0\)
\(0:1 = 0\)
2.Số ?
3.Tính :
a)
\(\eqalign{ & 4:4 \times 0 = 1 \times 0 \cr & {\rm{ = 0}} \cr} \) \(\eqalign{ & 8:2 \times 0 = 4 \times 0 \cr & {\rm{ = 0}} \cr} \) \(\eqalign{ & 3 \times 0:2 = 0:2 \cr & {\rm{ = 0}} \cr} \)
b)
\(\eqalign{ & 0:5 \times 5 = 0 \times 5 \cr & {\rm{ = 0}} \cr} \) \(\eqalign{ & 0:2 \times 1 = 0 \times 1 \cr & {\rm{ = 0}} \cr} \) \(\eqalign{ & 0 \times 6:3 = 0:3 \cr & {\rm{ = 0}} \cr} \)
