,30 + 4 = 34,34 - 4 = 30,4 +30 = 34,34 - 30 = 4,绿色圃中小学教育网http:/,填空 ()四十五里面有()个十和()个一, ()可以分成()个一和()个十, (3)7个一和个十组成(),()是()个十和()个一组成的,4,5,4,6,37,2,8,30+6= 7+50= 87-7= 63-3= 52-2= 5+40= 88-8=,6+60= 40+4= 45=( )+( ) 84-( )=81 38-( )=8 99-( )=( ) ( )-2=70,36,57,80,60,50,45,80,66,44,40,5,3,30,90,9,72,