8X+ 109=2325
8x=2325- 109
8x=22 16
x=22 16/8
X=277 A: the average annual precipitation in Tongxin County is 277mm.
5. Solution: Suppose the elephant can reach X kilometers per hour at the earliest.
2X+30= 1 10
2x= 1 10-30
2x=80
x=80/2
x=40
A: Elephants can reach 40 kilometers per hour at the fastest.
6. Solution: Let the area of Oceania be x million square kilometers.
4x+8 12=4400
4x=4400-8 12
4x=3588
x=3588/4
x=897
A: The area of Oceania is 8.97 million square kilometers.
7. Solution: Let the child's body temperature be equivalent to X degrees Celsius.
1.8x+32=98.6
1.8x=98.6-32
1.8x=66.6
x=66.6/ 1.8
x=37
A: The child's temperature is equivalent to 37 degrees Celsius.
If so, please adopt it! ! !