计算。⑴89+7= 36+5= 4+29= 53+8=⑵6+41= 7+25= 43+4= 40+42=⑶52+20= 63+8= 48-6= 9+39=⑷74-4= 37+4= 40+28= 8+27=⑸74-(80-50)= 5+78-40= 51+20-30=
9+10= 10+8= 2+10= 10+0= 10+6= 10+4=
1+10= 10+2= 10+6= 10+9= 10+7= 0+10=
10+3= 10+6= 9+10= 5+10= 7+10= 10+8=
10+2= 10+3=10+5= 3+10= 4+10= 6+10=
7-0= 6-1= 7-3= 8-5= 4-2= 9-7=