啊,我的眼。。。
两式比较大小,则用相减后与零比较大小
注意最小公倍数是取因子的最大指数。
A选项,30=2*3*5, 6=2*3, X=5*2^(0,1)*3^(0,1)。这种情况下可以算出6,9=3^2,X的公倍数是90
B选项,同理45=3^2*5,9=3^2,X=5*3^(2,1,0),这种情况下也可以算出公倍数是90
m=(p^a)(t^b) 求因数数量 => (a+1)(b+1)
任何一个自然数的因子个数 为质因数分解中 每个质因子的指数加1的乘积
i.e. 20=(2^2)(5^1) 所以20的因子个数为(2+1)(1+1)=6个,分别是1,2,4,5,10,20
破题点模糊,要耐心:按绝对错误层级与相对错误层级划分
https://forum.chasedream.com/thread-499047-1-1.html
a trippling 是瞬间的动作,与段落时间 course不匹配
challenge & defend
in which brown bears and sloth bears are similar?
exclusively 专一的,排外的 ➡️ 只是在说evolved in an environment with few trees,并不是说他们几乎都生活在treeless environment
🌟 注意选项中出现的带绝对性质的词,一般会排除
it is expected that
sb/sth is expected to do
sb expext that
代词it的指代对象只能是名词而不能是一个句子或动词
not…but… 要求连接两者平行
如果过去分词放在逗号之后,在99%的情况下等于which非限定从句。
时地全等
因为如果直接按照公式展开,abc分别代表的是任意数,所以可以把abc随便赋值再代入公式算,能使计算简单,不容易出错。
很容易能够验证II正确,所以答案只能是CE,由此I肯定正确,只要看一下III对不对。
I对的
II rs:假设r=0.9, s=1.9, rs =1.71>1
III s-r: 假设s=1.9, r=0.1, s-r=1.8>1
5个苹果随机拿两个,有10种拿法;其中一个是坏的,有4种拿法;所以概率是4/10=2/5
BDE里边unlike的比较对象不对等,排除;C里边which的用法错误,排除。
the sentence is stating a contrast: condition X is true for cod and haddock, but false for monkfish.
here's another example, similarly constructed:
[i]There is no snow in Los Angeles, as there is in more northern locations.
there be句型的平行要补出there be。
主语是复数most of the purported health benefits,谓语用come from,排除AB。
compounds是antioxidants的同位语,由于后面非划线部分是动词inhibit, 而且从意思上来理解,found in beta carotene, ...和inhibit the formation ...应该都是在说的antioxidants,所以要用两个that从句来作定语修饰compounds。
C and如果是跟前面的句子并列,inhibit的主语就变成了benefits,语义错误。
E and后面的句子如果是跟前面的句子并列,they指代的是benefits,语义错误。
increased by the same fraction
Here, with fears seems to modify sell -- the nearest preceding action -- implying that the country will use FEARS to sell its gold reserves.
This meaning is nonsensical.
The intended meaning is that fears will RESULT from the sale of the gold reserves.
hunters应该对应scavengers,主语是image单数,谓语用has,所以剩下CDE。
C中that includes如果是修饰的tools,要用include。还有就是image不能从tools里边emerge,语义错误。
D中which includes中,根据后面非划线部分,可以知道which修饰的是tools复数,所以includes错误。
rising sea level 强调的是 sea level 而不是rise 这个过程