第二部分：數(shù)學(xué)答案
勾股數(shù)（1） 1.C 2.D 3.60/13cm 4.13 5. 連接B、D，36cm2 6.C
勾股數(shù)（2）1.C 2.B 3.A 4.130 5.24
實數(shù) 1.A 2.C3.正負(fù)根號5 4.2倍根號2 5.0 5.1
6.（1）2倍根號2 （2）根號3（3）14+4倍根號3（4）6
P22 平移與旋轉(zhuǎn)
一：AB 二：7.5 60
P23
6.（2）解：∵正△ABC
∴AB=BC
又∵△ABD由△ABC旋轉(zhuǎn)
∴△ABD≌△ABC
∴AB=BC=AD=DC
∴四邊形ABCD為菱形
第三部分 英語答案
P37 happy1
一
what a melody(悅耳) song it is!
what a fast boy he is !
what a heavy girl she is !
what a beautiful school it is !
what a good boy he is !
what a beatific(幸福) boy he is!
二
is cleaned
were taken
is maken
was showed
are inviten
wasn't gave
was slolen ; was found
三
turtle
tiger
japan
Mexico
tiger
sierra leone
P39.
一：
better best havier heaviset
more most older oldest
bigger biggest more expensive most expensive
more smart most smart better known best known
more badly most badly less leas
more carefully most carefully fewer fewest
more slowy most slowy thinner thinnest
more healthy most healthy more easily most easily
hotter hoyyest oftener oftenest
farer farest larger largest
