混合运算。956-215×4 785÷(35÷7)
4+2= 7-4= 7-6 = 10-8= 10-3= 5+3=
6+3= 7+2= 9+1= 7+1= 8-5= 6-3=
8-4= 6+0= 5+2= 10-9= 10-8= 8+2=
9-4= 10-3= 9-3= 10-7= 7-5= 6-4=
8-5= 8+2= 9-7= 4+4= 10-5= 4+2=