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<style>table{border-collapse:collapse;}th,td{border:1px black solid;width:3em;text-align:center;}th{background-color:#7a76ca;}button{font-size:x-small ;}</style> <table><tr><th>添字</th><th>a</th><th>b</th><th>加算</th><th>減算</th><th>乗算</th><th>除算</th></tr><tr><th>0</th><td>12</td><td>24</td><td><button>計算</button></td><td><button>計算</button></td><td><button>計算</button></td><td><button>計算</button></td></tr><tr><th>1</th><td>100</td><td>10</td><td><button>計算</button></td><td><button>計算</button></td><td><button>計算</button></td><td><button>計算</button></td></tr><tr><th>2</th><td>122</td><td>41</td><td><button>計算</button></td><td><button>計算</button></td><td><button>計算</button></td><td><button>計算</button></td></tr></table>