1: Tính nhẩm
\(1 \times 2 = …..\) \(1 \times 3 = …..\) \(1 \times 4 = …..\) \(1 \times 5 = …..\)
\(1 \times 1 = …..\) \(2 \times 1 = …..\) \(3 \times 1 = …..\) \(4 \times 1 = …..\)
\(5 \times 1 = …..\) \(1:1 = …..\) \(2:1 = …..\) \(3:1 = …..\) \(4:1 = …..\) \(5:1 = …..\)
2: Số ?
3: Tính
a)
\(\eqalign{ & 2 \times 3 \times 1 = ……… \cr & {\rm{ = }}………. \cr} \) \(\eqalign{ & 2 \times 1 \times 3 = ……… \cr & {\rm{ = }}………. \cr} \)
b)
\(\eqalign{ & 4 \times 5:1 = ……… \cr & {\rm{ = }}………. \cr} \) \(\eqalign{ & 4:1 \times 5 = ……… \cr & {\rm{ = }}………. \cr} \)
c)
\(\eqalign{ & 8:4 \times 1 = ……… \cr & {\rm{ = }}………. \cr} \) \(\eqalign{ & 8 \times 1:4 = ……… \cr & {\rm{ = }}………. \cr} \)
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d)
\(\eqalign{ & 12:3:1 = ……… \cr & {\rm{ = }}………. \cr} \) \(\eqalign{ & 12:1:3 = ……… \cr & {\rm{ = }}………. \cr} \)
Giải
1: Tính nhẩm
\(1 \times 2 = 2\) \(1 \times 3 = 3\)
\(1 \times 4 = 4\) \(1 \times 5 = 5\)
\(1 \times 1 = 1\) \(2 \times 1 = 2\)
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\(3 \times 1 = 3\) \(4 \times 1 = 4\)
\(5 \times 1 = 5\) \(1:1 = 1\) \(2:1 = 2\)
\(3:1 = 3\) \(4:1 = 4\) \(5:1 = 5\)
2: Số ?
3: Tính
a)
\(\eqalign{ & 2 \times 3 \times 1 = 6 \times 1 \cr & {\rm{ = 6}} \cr} \) \(\eqalign{ & 2 \times 1 \times 3 = 2 \times 3 \cr & {\rm{ = 6}} \cr} \)
b)
\(\eqalign{ & 4 \times 5:1 = 20:1 \cr & {\rm{ = 20}} \cr} \) \(\eqalign{ & 4:1 \times 5 = 4 \times 5 \cr & {\rm{ = 20}} \cr} \)
c)
\(\eqalign{ & 8:4 \times 1 = 2 \times 1 \cr & {\rm{ = 2}} \cr} \) \(\eqalign{ & 8 \times 1:4 = 8:4 \cr & {\rm{ = 2}} \cr} \)
d)
\(\eqalign{ & 12:3:1 = 4:1 \cr & {\rm{ = 4}} \cr} \) \(\eqalign{ & 12:1:3 = 12:3 \cr & {\rm{ = 4}} \cr} \)
