50﹣10= 58﹣50= 22+8= 70﹣9=
9+42= 29﹣8= 28+15= 78﹣19=
27+(10﹣7)= 41﹣20+20= 58+30﹣21= 55﹣(95﹣40)=
1+9=
2+7=
10-10=
13-0=
17+2=
18-3=
14-4=
11+3=
6+0+4=
16-1-2=
9+5-3=
15-5+2=
10+5= 16-6= 1+13= 10+4=
13-10= 19-9= 8+10= 12+7=
17-6+7= 16-6-3= 12-2+4= 11+4-2=
2+9= 7+5= 10+8= 6+9=
5+8= 4+8= 16–6= 9–5=
7+8 = 3+7= 9+4= 14+5=
6+8 = 5+9= 9+9= 18–6=
18–7+4= 17+2–6= 18–3–2=
19–5–5= 16–2-1= 3+5+9=
5+4= 7-5= 3+4= 8-3=
8+9= 7+8= 5+9= 17-6=
10+10= 3+8= 18-6= 13+5=
12+7= 19-5= 10-7= 13+0=
1+6+9= 14-4+6= 9+9-5=
8-3+7= 17-2-15= 8+5+2=
①0.83+1.675 ②756+1328 ③+ ④57%+
①1204+879+121
②74×60%+×25+0.6
③1.2÷×(0.6﹣)
④×[﹣(+)]