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$第3课时 1.比例的基本性质比例未知项 2.63. 4.10410 5.(1) (2)2.5:a=3.6:4.8 (3)x3=7:2.5(答案不唯一) 6 7.5995 95 1.×2.×3.×4.V5.√ 三、x=6.4,x=5,x=65,x=0.1,x=105,x=3 四、1.(1)9:x=12:10(答案不唯一),x=7.5 (2)358:x(答案不唯一),x≈63 160 2.解:设已经走了x米,3:5=x:280,x=168,168 +280=448(米),答:略 3.解:设A的面积为x平方厘米 x=90×÷,x=81,答:略