北師大版三年級數(shù)學上冊奇奇文具店1.80元4.90元丁丁文具店4.89元5.10元2.00元豆豆文具店4.25元1.90元4.28元4.68元去哪個文具店買鉛筆盒便宜？4.9元?5.1元4.9元=4元9角5.1元比5元多5.1元=5元1角4.9...