一、解方程
1)66x+17y=396725x+y=1200答案:x=48y=47(2)18x+23y=230374x-y=1998答案:x=27y=79(3)44x+90y=779644x+y=3476答案:x=79y=48(4)76x-66y=408230x-y=2940答案:x=98y=51(5)67x+54y=854671x-y=5680答案:x=80y=59(6)42x-95y=-141021x-y=1575答案:x=75y=48(7)47x-40y=85334x-y=2006答案:x=59y=48(8)19x-32y=-178675x+y=4950答案:x=66y=95(9)97x+24y=720258x-y=2900答案:x=50y=98(10)42x+85y=636263x-y=1638答案:x=26y=62
二、整式运算
(1)5(3a-2b)^2-2(2a+3b)^2-3(2b-3a)^2+4(3b+2a)^2
答案:26a^2+26b^2
(2)[a-(1/2)]^2[a^2+(1/4)]^2[a+(1/2)]^2
答案:a^8-(1/8)a^4+(1/256)
(3)[(-3/4)x^6y^3+(6/5)x^3y^4-(9/10)xy^5]÷(3/5)xy^3
答案:(-5/4)x^5+2x^2y-(3/2)y^2
(4)已知y=ax^5+bx^3+cx-2,当x=-3时,y=4,那么当x=3时,求y的值.
答案:-8