SAT数学一直被认为是中国考生的高分项目,但是斩获满分还是不容易的,为了帮助考生更好的收获满分,SAT小编通过对于SAT数学的学习总结了一些小技巧分享给大家,希望这些SAT数学运算的一些小技巧可对对考生有所帮助。
1.对于任何乘以0的数:a*0=0,反过来如果两个或者多个数的积是0,那么他们中至少有一个是0。
• If ab = 0, then a = 0 or b = 0.
• If xyz = 0, then x = 0 or y = 0 or z = 0.
例题:What is the product of all the integers from –3 to 6?
解析:求所有从-3到6的所有整数的积是多少?
从-3到6中包含整数0,所以他们的积是0,不用过多的思考和计算了。
2. The product and the quotient of two positive numbers or two negative numbers are positive; the product and the quotient of a positive number and a negative number are negative.任意两个整数或者两个负数的乘机是一定是正数,任意一个正数与一个负数的成绩一定是负数。
3. • The product of an even number of negative factors is positive.
偶数个负数相乘的积一定是正数
• The product of an odd number of negative factors is negative.
奇数个偶数相乘的积一定是负数。
4. The reciprocal of any nonzero number a is . 1/a
任何不是0的数的到倒数表示为1/a
The product of any number and its reciprocal is a(1/a) = 1.
任何一个数与其倒数的成绩都是1.
• The sum of two positive numbers is positive.
任何两个正数的和是正数
• The sum of two negative numbers is negative.
任意连个负数的和是负数
• To find the sum of a positive and a negative number, find the difference of their absolute values and use the sign of the number with the larger absolute value.
求出一个正数与一个负数的和,找到两个数的绝对值的差取较大的数的正号或者负号。
5. The sum of any number and its opposite is 0: a + (–a) = 0.
任意一个数与其相反数的和是0
6. To subtract signed numbers, change the problem to an addition problem by changing the sign of what is being
Subtracted。
对于计算带有正负号的减法,通过改变他们的正负号来将等式转换为加法的式子在。例如
2-6=2+(-6)=4
7. The product of the GCF and LCM of two numbers is equal to the product of the two numbers.
两个数的最大公因数与最小公倍数的乘积与这两个数的乘积相同。
例如:假设6和8这两个数,他们的最大公因数是2,最小公倍数是24,2*24=48
而这两个数的乘积也是48,是相同的。
以上就是小编为个为考生整理的SAT数学运算的一些小技巧,考生不单单要熟记这些技巧,还要进行运用,熟能生巧的道理大家都懂得,考场上一定可以为大家节约时间提高分数的。
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