《求加法里的未知数》课件VIP

求加法里的未知数3+4=5+5=7+3=7–2=5+4=6+3=4+4=7+2=8–6=6+4=8–5=10–5=5–5=10–6=8–2=热热身吧758100109934109256Hello！951031051021...