86-40 () 86-4 87+10 () 10+87
哪张卡片合适?用不等式表示


50+40=
20+60=
60+40=
70+20=
10+90=
50+50=
30+4090 80-3020 60-1049
70+1090 20+30 50 20+5069
2×5= 3+4= 5+3= 3+3+3+3= 43-(7+30)=
28+4= 49-9= 62-20= 80-30= 66-8+14=
9+8= 16-9= 38-6= 40+30=
80-50= 50+6= 26-10= 28+30=
35-0= 14+7=