1二年级数学口算作业2x3+6=5x3+4=3x4-10=4x4-5=5x4+3=5x5+10=4x4+6=2x4+3=4x5-7=3x5+8=4x5-2=4x5+13=3x4+9=2x6+9=6x5+11=3x6+8=6x3+7=5x6-7=6x2+8=5x3+20=40-10-9=46+4-20=2+58+7=7+47-9=72-3-50=6x2+8=4x3+12=6x5-8=6x6+8=27-9+50=60-30+9=27-9+50=6x7+40=7x4-2=2x7+8=7x5-8=6x7+9=7x3+40=5x7+8=7x2+5=7x7-10=2x7+4=3x5+7=7x4-20=6x7-9=7x3+20=3x4+70=4x8+2=3x8+9=7x6+8=8x4+2=6x3-3=8x7-10=4x3+20=6x3+8=5x4-9=8x5+7=4x8+6=8x8-24=3x8+8=7x7+7=5x7+8=7x2+10=7x9-23=5x8+32=8x9+3=9x6+16=5x9-15=3x8-15=7x8-19=3x9+13=8x9-7=9+21+70=23+7+30=46-(16-10)=18+40-8=45-(40+5)=50-(28-8)=46-30+7=74-6-30=9+(40-38)=6x7+20=87-(49-39)=7x8+14-87-(67-30)=6x3+12=7x9+17=9x8+18=45+(52-28)=85-36=73-(35-24)=7x8+15=43-4x7=66-4x7=44-7x6=36-3x3=17+28+28=33+2+38=76-7x3=77+21+9=21、46+28+23=2、42-36+51=3、70-22-28=4、81-16+33=5、72-29+59=6、38+55-67=7、86-34-49=8、60-23=9、