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        英語中一些數(shù)學(xué)式的表達

        2014-10-21 20:08:18葛乾
        校園英語·下旬 2014年12期

        葛乾

        一、小數(shù)表示法

        A.小數(shù)用基數(shù)詞來表示,以小數(shù)點為界,小數(shù)點前的整數(shù)部分按數(shù)目整體讀,小數(shù)點后應(yīng)一位數(shù)一位數(shù)來讀。小數(shù)點讀作point,0 讀作zero 或O,整數(shù)部分為零時,可以省略不讀。如:0.5 讀作zero(O) point five; 或point five,3.14 讀作three point one four.

        B.當(dāng)數(shù)字值大于1時,小數(shù)后面的名詞用復(fù)數(shù);數(shù)字值小于1時,小數(shù)后面的名詞用單數(shù)。如:

        1.03 meters 1.03米 0.56 ton 0.56噸 6.8 tons 6.8噸

        二、分?jǐn)?shù)的表達法

        A.分子用基數(shù)詞,分母用序數(shù)詞。分子大于1時,分母的序數(shù)詞要加“s”。如:讀作one third; 讀作two thirds;

        2 讀作two and two thirds;

        讀作twenty-four twenty-fifths

        讀作 a half 或one half 表示;

        可用one fourth,也可用a quarter 或one quarter表示;

        B.在語句中表示“幾分之幾的……” 要與介詞of 連用,

        的學(xué)生 one third of the students.

        C.當(dāng)分?jǐn)?shù)后面接表示單位量的名詞時,如果分?jǐn)?shù)表示的大于1,名詞用復(fù)數(shù);小于1,名詞用單數(shù)。如:

        1 hours 一個半小時,2 meters 二又四分之三米

        meter五分之四米

        三、百分?jǐn)?shù)表示法

        百分?jǐn)?shù)用“基數(shù)詞+percent” 表示,無論基數(shù)詞多大,percent 都不加-s。如:5%讀作five percent;

        0.12% 讀作zero point one two percent

        表示“百分之幾的……”要與of 連用。

        如:30%的學(xué)生:

        30% of the students 或thirty percent of the students

        四、加減乘除表示法

        A.“加“用plus表示“等于”用equals; is equal to; is; makes等詞表示。

        2+3=?How much is two plus three?

        2+3=5 Two plus three is (equals; is equal to; makes) five

        B.“減”用minus 表示。

        8-3=?How much is eight minus three?

        8-3=5 Eight minus three is ( equals; is equal to ; makes) five

        C.“乘”用times 或multiplied by表示。

        3×3=? How much is three times three?

        3×3=9 Three times three is (equals; is equal to; makes)nine.

        Three multiplied by three is nine.

        D.“除”用divided by 表示。

        16÷4=?How much is sixteen divided by four?

        16÷4=4 Sixteen divided by four is four.

        五、一些計算式

        (1) x2 讀作 x squared 或x to the second power 或the second power of x

        32=9 Three squared is nine; The second power of 3 is 9;

        Three to the second power is nine;

        x3 讀作x cubed 或x to the third power 或the third power of x

        33=27 Three cubed is twenty-seven;

        Three to the third power is twenty-seven;

        x4 讀作x to the fourth power 或the fourth power of x

        34=81 Three to the fourth power is eighty-one.

        (2) the second root of x 或the square root of x

        =3 The second square root of 9 is 3;

        =3 The third (cube) root of 27 is 3;

        =3 The fourth root of 81 is 3.

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