书面表达;.连词成句,注意大小写和标点符号 1.friend's, your, name , what, is__________________________________? 2..friends,his,boys,are,those __________________________________. 3.on, your, is, the ruler, sofa ________________________________________? 4.this, blue, is, hers,, hat _________________________________________. 5. you, spell, how, it, do __________________________________________?求下列各式中的x(1)x2=4 (2)7x2-=0.