( 1) 1: 10 1

(2) 1/9 times 3

(3)3/ 1 3: 1400 3:4

(4)5 3 4/35

Two.

3: 1=3

6:2=3

3: 1 = 6: 2 (the answer is not unique)

Three.

(1) is out of proportion.

(2) Yes, in direct proportion.

Yes, it is inversely proportional.

(4) Yes, in direct proportion.

Four.

Solution: Let 5.4kg water contain hydrogen x kg.

1/ 1+8=x/5.4

x=0.6

Hydrogen content: 0.6 kg

Oxygen content: 5.4-0.6=4.8

A: Yes. . . . . .

Five.

Solution: Suppose X blocks are needed.

8*350= 10x

x=280

A: Yes. . . . . .