4.4+1.5=
3.1-1.1=
0.2+0.78=
9.8-5.6=
0.33+9.8=
0.6+0.7=
6.3-6.2=
4.3-2.5=
10.2+0.02=
9.2+6.8=
0.17+0.06=
0.15+0.7=
1.9+5.7=
1.02-0.09=
6.7+2.5=
8.8-6.9=
9-7.2=
10.2+0.2=
1-0.3=
0.17+0.6=
9.2-6.1=
3.6+1.5=
0.83-0.3=
8.5+5=
7.3+5.2=
3-1.7=
3.2-3.2=
3.1-0.9=
0.98-0.09=
3.7+2.3=
23×2=
80-26=
16×5=
53+28=
54+45=
71-28=
83×3=
78+822=
88+16=
600-340=
710×8=
189×0=
76-47=
50×4=
330+48=
206×5=
=
1-=
-=
600-187≈
392+514≈
198×6≈
413×5≈
49+61=
800-310=
24×2=
25×4=
12×3=
700×8=
49×3≈
198×5≈
类型:货船载重:5000吨
“远航”号安装风筝帆的费用是560万元,如果柴油价格按每升7元计算,大约需要多少年节省的柴油费才可以抵消安装风筝帆的费用?