想一想，算一算。(14分)
16-7=
28+6=
37-8=
29+8=
60-40=
78-8=
45+5=
50-50=
11+9=
17-8=
50-7=
25+3=
74-9=
18+30=
26-3=
45-7=
26+70=
68-50=
87+8=
9+60=
43-8-30=
60+38-90=
64+5-30=
15+4-9=
想一想，算一算。(14分)
16-7=
28+6=
37-8=
29+8=
60-40=
78-8=
45+5=
50-50=
11+9=
17-8=
50-7=
25+3=
74-9=
18+30=
26-3=
45-7=
26+70=
68-50=
87+8=
9+60=
43-8-30=
60+38-90=
64+5-30=
15+4-9=