学校开展节约用水活动，前3个月共节约用水435吨．照这样计算，学校一年能节约用水多少吨？
直接写出得数．×60= 12÷= 3.14×42=（）2=×=+=÷=÷=
直接写得数．×4=+=+=÷= 25÷=﹣=÷5=×= 2÷=﹣=×12= 2﹣﹣=
口算========
直接写出得数．== 11=== 0÷1.2======= 12=== 54=
直接写出得数×=×=×18=÷8= 6÷=××=÷=÷=÷÷= 0.25+=﹣=÷×=÷=×= 8﹣4÷=﹣=÷14= 12×（﹣）= 5%×5=+++= 3.75+= 63%﹣27%=（1﹣20%）÷20%= 0.4÷=×1.8=×25%=
×60= 12÷
= 3.14×42=（
）2=
×
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+
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×4=
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=
÷
=
=
﹣
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×
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= 11
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= 0÷1.2=
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= 54
=
×
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×
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×18=
÷8=
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= 0.25+
=
﹣
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= 8﹣4÷
=
﹣
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÷14= 12×（
﹣
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+
+
+
=
= 63%﹣27%=（1﹣20%）÷20%= 0.4÷
=
×1.8=
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