估算71×39≈ 27.04÷8.92≈ 3.17万+6.9万≈ 291090﹣9986≈
直接写出得数．========
直接写出得数．============
计算．﹣++（+） 7﹣（﹣）．
直接写得数：+=﹣=﹣=﹣=+=﹣= 1﹣=+=﹣=+=+5= 5﹣=
直接写得数．+=+=﹣= 0.25×8= 0.9×0.2=﹣=+= 10﹣= 1.25×（0.8+0.08）= 0.25×3.2=
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= 1.25×（0.8+0.08）= 0.25×3.2=