Bantu jawab dengan caranya

<p>ok saya bantu jawab ya......</p><p>&nbsp;</p><p>&nbsp; &nbsp; &nbsp; 1. &nbsp; &nbsp; &nbsp; &nbsp;3 1 2 4</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<u> &nbsp; &nbsp;4 5 7&nbsp;</u> x</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2 1 8 6 8</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1 5 6 2 0</p><p>&nbsp; &nbsp; &nbsp; &nbsp;<u> 1 2 4 9 6 &nbsp; &nbsp; &nbsp; &nbsp;</u> +</p><p>&nbsp; &nbsp;&nbsp;<strong> &nbsp; 1.4 2 7.6 6 8&nbsp;</strong> &nbsp;&nbsp;</p><p>&nbsp;</p><p>2. &nbsp; &nbsp; &nbsp; &nbsp; 4 8 1 0</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<u> &nbsp; &nbsp; &nbsp;2 7 0 &nbsp;</u>x</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0 0 0 0</p><p>&nbsp; &nbsp; &nbsp; &nbsp;3 3 6 7 0</p><p>&nbsp; &nbsp;&nbsp;<u> &nbsp; 9 6 2 0 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</u> +</p><p>&nbsp; &nbsp;<strong>1.2 9 8.7 0 0</strong></p><p>&nbsp;</p>