3004kg3.04t 123-68+△123-(68+△)( △>0)
750cm7.5m 125×25×4×8125×8+25×4
距离/km
70
140
210
280
350
420
…
时间/时
1
2
3
4
5
6
①11+2x=12
②0.7x+3.6x=43
③7:x=:
④
526﹣198= 0.32×2.5= n×n= kg:240g=
24×+= 2.6+1.98= -= 1.6÷25%=
÷= ×÷×0=