（1/2ab+a^2-b^2)·2ab-（-ab）^2看不清楚到我的相册去看图.

相关推荐

• （1/2ab+a^2-b^2)·2ab-（-ab）^2看不清楚到我的相册去看图.
• 1.用所给词的适当形式填空LOOK at the__(knife)on the desk.whose are they二.根据汉语提示完成句子1.who is ____ _____(第二个女孩）?2.this is _____ ______ ____（一棵橘子树）三.用适当的冠词填空1.mr read is___englishman2.ann often plays ___erhu in ___afternoon3.there's___egg on the table.___egg is very small4.please listen to ___teacher carefully now5.___teacher under the tree is our head teacher6.let's study___fourth lesson7.do you know___girl under the big tree8.___moon goes round___earth and____eart
• 王华同学去某批零兼营的文具商店，为学校美术活动小组的30名同学购买铅笔和橡皮，按照商店规定，若给每人买2支铅笔1块橡皮，则必须按零售价计算，需支付30元；若给每人各买3支铅笔和2块橡皮，则可按批发价计算，需支付40.5元，已知每支铅笔的批发价比零售价低0.05元，每块橡皮的批发价比零售价低0.10元，问这家商店每支铅笔和每块橡皮的批发价各是多少元？