The answers to exercises 12, 4, 5, 6 and 7 in the first volume of the fifth grade math book should be sprayed around. Don't be mean, don't say you can't write, ask if you can.

4. Assume that the average annual precipitation in Tongxin County is x mm..

8X+ 109 = 2325 8X = 22 16 X = 277

A: The average annual precipitation in Tongxin County is 277mm.

There is something wrong with this unit. Is 30Km more than twice that of an elephant?

Suppose the elephant can reach x kilometers per hour at the earliest.

2X+30= 1 10 2X=80 X=40

A: Elephants can reach 40 kilometers per hour at the fastest.

6. Missing a value: What is the area of Asia?

7. Let the child's body temperature be equivalent to X degrees Celsius.

1.8X+32=98.6

1.8X=66.6

X=37

A: The child's temperature is equivalent to 37 degrees Celsius.