请你估算一下．52×7≈ 61×8≈ 89×5≈21×5≈ 298×3≈ 204×5≈
直接写出得数+=﹣= 0÷6= 39×= 15﹣= 1÷= 21÷=（+）×6=×÷×= 8×﹣=
直接写出得数．========
口算．== 5﹣== 0×1= 1÷===
直接写得数．========
直接写得数+=÷7=×=÷=×8= 9÷= 15×=﹣=÷=×=×=÷=
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