六一会演布置舞台背景，背景是一个长6米，宽4米的长方形布，每平方分米布3元，请算一算这块布需要多少钱？
直接写得数．+= 3﹣1.75=÷=×=×=÷=÷=×0+3=（+）×=
直接写出得数．+=﹣=×2=×=÷3×÷3== 12×=×14=÷4=+÷+=
直接写得数+= 3+1.75=÷=×=×=﹣=+=×0+3= （+）×=×÷×=
口算下面各题．﹣=+=﹣= 2÷=×6=÷=×6=×=﹣=÷=÷=×=×=÷=÷= 6.4÷0.08= 4﹣2.92=÷=
直接写得数： 1﹣=×=÷2÷= 2×80%=+= 15÷= 35×=×÷×=
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