红星小学四年级同学植树450棵，五年级同学植树的棵树比四年级的20倍少1800棵，五年级同学植树多少棵？
直接写出得数．===== 1﹣=
．
25×8= 8.5﹣3.7= 0.56÷0.07= 4×9.2×0.25======
直接写出结果． 12÷0.4= 9.9×50= 2+0.75=+= 3+= 0.5×40= 2﹣=﹣=
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= 1﹣
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+0.75=
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= 0.5×40= 2﹣
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﹣
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