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Sixth grade math! ! ! ! It's urgent ! ! ! Make sure everything is all right! ! ! ! Speed, speed. ! ! ! !
1.(1)1:5,2: 10, 1: 5 = 2: 10 (2) equals,1/2,4.

2.( 1) is wrong for (2)

3. (1) 6:10 = 9:15 (2) 20: 5 = 4:1(3) Cannot form a proportion (4) Cannot form a proportion.

4.( 1) cannot form the ratio (2)2:40=8: 160.

5.( 1)B (2)

6. 1.5:3=2:4 1.5:2=3:4 3: 1.5=4:2 2: 1.5=4:3

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