3:(1)(6.6-6.2)÷6.2
= 0.4÷6.2×100%
≈ 6.5%
(2)(159.1-150.2)÷159.1×100%
= 8.9÷159.1×100%
≈ 5.6%
4:(1)0.5÷(4.5+0.5)×100%
= 0.5÷5×100%
= 10%
(2)0.5÷4.5×100%≈11.1%
5: (6600-6400)÷6600×100%
= 200÷6600×100%
≈ 3%
答:亚马孙河的长度大约比尼罗河短3%。
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