(1)10(x+y)
(2)当x=300,y=200时,
10(x+y)=10×(300+200)=5000(千克)
答:超市现有大米5000千克。
4:
S=(a+b)h÷2
=(7.8+9.1)×8÷2
= 16.9×8÷2
= 67.6(平方厘米)5:
(1)2000-ax
(2)当a=45,x=12时,
2000-ax
= 2000-45×12
=1460(米)
答:乙队修了1460米。6:
28 5n+3
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