整式加减计算题20道

问题描述:

整式加减计算题20道

85+56= 68+23= 78+45= 63+58= 54+32= 56+89=
89+78= 64+48= 13+56= 56+78=
46-13= 13-2= 36-25= 100-78= 789-45=
46-23= 45-43= 1000-365= 2010-89= 2011-654=

题呢?

1.3ab-4ab+8ab-7ab+ab=______. 2.7x-(5x-5y)-y=______. 3.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 4.-7x2+6x+13x2-4x-5x2=______. 5.2y+(-2y+5)-(3y+2)=______. 6.(2x2-3xy+4y2)+(x2+2xy-3y2)=______...