下列计算中,(1)x5+x3=x8;(2)2y4•3y2=6y8;(3)[(a+b)3]5=(a+b)8;(4)[(x+y)(x﹣y)]7=(x+y)7(x﹣y)7,其中正确的个数是( )
A:1
B:2
C:3
D:4
—No, he ____(try)to, but failed.
戴黄色眼镜看白纸,白纸变成黄色,这是由于 ( )
wǔ rǔ
qiáng shèng
sā huǎng
____
guī jǔ
péi bù shì
qiáng dáo
yàn zǐ
huái nán
ān jū lè yè