5: (20-1.8)÷6.5
= 18.2÷6.5
= 2.8(元)
6: 252÷2.4×3.6=378(页)
7: (2.8+1.4)×1.6÷2
= 4.2×1.6÷2
= 3.36(平方米)
≈ 3.4(平方米)
8: 412.5÷5×3=247.5(元)
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5: (20-1.8)÷6.5
= 18.2÷6.5
= 2.8(元)
6: 252÷2.4×3.6=378(页)
7: (2.8+1.4)×1.6÷2
= 4.2×1.6÷2
= 3.36(平方米)
≈ 3.4(平方米)
8: 412.5÷5×3=247.5(元)
http://m.ksjqmj.com/wunianjidaan/2339.html
推荐访问