<h3>一、加</h3><div><br></div><div>英语的“加”叫add，来自拉丁语addo，ad即“to”; do “put”合起来即put to，也就是“加上”。请看以下add的用例：</div><div><br></div><div>Add 360 to the total. 在总数上再加360。</div><div><br></div><div>The costs added up to 1000 dollars. 费用总计为1000美元。</div><div><br></div><div>First, we add water;next we boil. 我们先加水，接着把水煮开。</div><div><br></div><div>注：类似“3+4=7”这样的算式，可用以下包含add的英语句子表达：</div><div><br></div><div>Three added to four makes seven.</div><div><br></div><div>Three and four add up to seven.</div><div><br></div><div>If you add three to four, you get seven.</div><div><br></div><div>二、减</div><div><br></div><div>减，英语subtract，来自拉丁语的subtractus;sub即“away”; tractus “taken”。“减”就是“take away(去掉)”。请看以下用例：</div><div><br></div><div>If you subtract 3 from 5, you get 2. 五减去三就得二。</div><div><br></div><div>My son has begun to learn to add and subtract. 我的儿子已在学做加减法了。</div> <h3>三、乘</h3><div><br></div><div>“乘”叫multiply，来自拉丁语的multiplico;multus是“many”的意思;plico， “fold(倍)”，multiply即“manifold(多数倍的)”。请看例句：</div><div><br></div><div>Five multiplied by three is fifteen. 5乘以3等于15。</div><div><br></div><div>表示两数相乘时，除可用multiply, 也可用times。如：</div><div><br></div><div>Five times eight is forty.</div><div><br></div><div>=Five multiplied by eight is forty. 5乘以8等于40。</div><div><br></div><div>注：在Five multiplied by eight is forty中，multiplied by eight为修饰five的过去分词短语(用作定语;句子主语是five)，其中的multiplied不能换成multiplying或to multiply等。比较：</div><div><br></div><div>If you multiply 7 by 15, you get 105. 如果用15乘以5，结果是105。</div><div><br></div><div>四、除</div><div><br></div><div>“除”叫divide，是“分开”的意思，来自拉丁语的divido; di即“apart”;vid-， “separate”。请看用例：</div><div><br></div><div>If you divide 20 by 4, the answer is 5. 如果你把20除以4，那么商就是5。</div><div><br></div><div>Ten divided by five is two. 10除以5得2。</div><div><br></div><div>Three will not divide into eleven. 三除不尽十一。</div><div><br></div><div> </div> <h3>咨询电话 / 微信 同步 美孚英语 15376998000</h3>