144×7/ 12+ 1 = 84+ 1 = 85(page)
②:
25× 15×45= 18000 (cubic centimeter)
2×(25× 16+25×45+ 16×45)
=2×(400+ 1 125+720)
=2×2245
=4490 square centimeters
4490 square centimeters =44.9 square decimeters
③:
According to the meaning of the question:
Length: width: height = 5: 4: 2
88÷4=22 cm
22÷(5+4+2)
=22÷ 1 1
=2
5×2+4×2+2×2
= 10+8+4
=22 (cubic centimeter)
④:
Solution: let b drive x kilometers per hour.
2.5×(48+x)=225
48+x=90
x=42
⑤:
Solution: Let A have x kg, then B has (160-x)kg.
2/3x= 1/3x+( 160-x)
1/3x= 160-x
4/3x= 160
x= 120
Finally finished ... I'm so tired ... My shoulders ache ... I wrote it on the spot, so I don't need to copy it ... You can ask me if you don't understand it in the future ~ if I am here ~