1, 45,54 : x = 18 : 5 2. đúng ghi Đ sai ghi S 0,8 = 8% ........ 0,8 = 80% ......................... 0,012 = 12%................ 0,012 = 1,2%........................ 3.tính 24,5% + 75,5% = ........... 100% - 35,7% = ....................... 23,4% x 5 = ..................... 12,3% : 4 = .....................

<p><p><strong><span style="text-decoration: underline;"><em>1:</em></span></strong></p></p><p><p><em>45,54 : x = 18 : 5</em></p></p><p><p><em>45,54 : x =&nbsp; &nbsp;3,6</em></p></p><p><p><em>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;x = 45,54 : 3,6</em></p></p><p><p><em>&nbsp; &nbsp; Vậy x =&nbsp; &nbsp; &nbsp; 12,65</em></p></p><p><p><span style="text-decoration: underline;"><strong><em>2:</em></strong></span></p></p><p><p><em>0,8 = 8%&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Sai</em></p></p><p><p><em>0,8 = 80%&nbsp; &nbsp; &nbsp; &nbsp;Đ&uacute;ng</em></p></p><p><p><em>0,012 = 12%&nbsp; &nbsp;Sai</em></p></p><p><p><em>0,012 = 1,2%&nbsp; Đ&uacute;ng</em></p></p><p><p><em><strong><span style="text-decoration: underline;">3:</span></strong></em></p></p><p><p><em>24,5% + 75,5% = 100%</em></p></p><p><p><em>100% - 35,7% = 64,3%</em></p></p><p><p><em>23,4% x 5 = 117%</em></p></p><p><p><em>12,3% : 4 = 3,075%</em></p></p><p><p>&nbsp;</p></p>