1: Viết số thích hợp vào chỗ chấm
\(\eqalign{a)
& {3 \over 5} = {{3 \times 2} \over {5 \times 2}} = {{…} \over {…}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{2 \over 7} = {{2 \times 3} \over {7 \times …}} = {{…} \over {…}} \cr
& {1 \over 4} = {{1 \times …} \over {4 \times 5}} = {{…} \over {…}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{8 \over 3} = {{8 \times …} \over {3 \times …}} = {{32} \over {…}} \cr
& {9 \over {12}} = {{9:3} \over {12:3}} = {{…} \over {…}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{25} \over {35}} = {{25:…} \over {35:5}} = {{…} \over {…}} \cr
& {{21} \over {14}} = {{21:…} \over {14:7}} = {{…} \over {…}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{56} \over {24}} = {{56:8} \over {24:…}} = {{…} \over {…}} \cr} \)
b) \({2 \over 5} = {{…} \over {10}};\,\,\,\,\,\,\,{{12} \over {30}} = {{…} \over {10}};\,\,\,\,\,\,\,\,\,\,\,\,\,{{72} \over {45}} = {8 \over {…}};\,\,\,\,\,\,\,\,\,\,\,\,\,\,{1 \over 4} = {7 \over {…}}\)
2: Viết tiếp số thích hợp vào chỗ chấm
a) \({{12} \over {20}} = {6 \over {…}} = {3 \over {…}}\) b) \({2 \over 5} = {{…} \over {10}} = {{…} \over {15}} = {{…} \over {20}}\)
c) \({{24} \over {36}} = {8 \over {…}} = {2 \over {…}}\) d) \({3 \over 4} = {… \over {12}} = {{…} \over {16}} = {{…} \over {20}}\)
3: Chuyển thành phép chia với các số bé hơn (theo mẫu)
Mẫu : 60 : 20 = (60 : 10 ) : (20 : 10) = 6 : 2 = 3
a) 75 : 25 = (75 : …) : (25 : 5) = ……
Advertisements (Quảng cáo)
b) 90 : 18 = (90 : …) : (18 : 9) = …..
1:
\(\eqalign{ a)
& {3 \over 5} = {{3 \times 2} \over {5 \times 2}} = {6 \over {10}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{2 \over 7} = {{2 \times 3} \over {7 \times 3}} = {6 \over {21}} \cr
& {1 \over 4} = {{1 \times 5} \over {4 \times 5}} = {5 \over {20}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{8 \over 3} = {{8 \times 4} \over {3 \times 4}} = {{32} \over {12}} \cr
& {9 \over {12}} = {{9:3} \over {12:3}} = {3 \over 4}\,\,\,\,\,\,\,\,\,\,\,\,\,{{25} \over {35}} = {{25:5} \over {35:5}} = {5 \over 7} \cr
& {{21} \over {14}} = {{21:7} \over {14:7}} = {3 \over 2}\,\,\,\,\,\,\,\,\,\,\,\,{{56} \over {24}} = {{56:8} \over {24:8}} = {7 \over 6} \cr} \)
Advertisements (Quảng cáo)
b \({2 \over 5} = {4 \over {10}};\,\,\,\,\,\,{{12} \over {30}} = {4 \over {10}};\,\,\,\,\,\,\,\,\,\,\,\,\,\,{{72} \over {45}} = {8 \over 5};\,\,\,\,\,\,\,\,\,\,\,\,\,{1 \over 4} = {7 \over {28}}\)
2:
a) \({{12} \over {20}} = {6 \over {10}} = {3 \over 5}\) b) \({2 \over 5} = {4 \over {10}} = {6 \over {15}} = {8 \over {20}}\)
c) \({{24} \over {36}} = {8 \over {12}} = {2 \over 3}\) d) \({3 \over 4} = {9 \over {12}} = {{12} \over {16}} = {{15} \over {20}}\)
3:
Mẫu : 60 : 20 = (60 : 10 ) : (20 : 10) = 6 : 2 = 3
a) 75 : 25 = (75 : 5) : (25 : 5) = 15 : 5
b) 90 : 18 = (90 : 9) : (18 : 9) = 10 : 2 = 5
