87-15=
7+63=
17+30=
56-20=
59+6=
37+22=
20+30=
56- 16=
38+4=
87-30=
905﹣260= =
= =
1.25×2.5×32= 8÷0.01=
808÷88≈ 697+296≈
2﹣30%= +25%= 4.23﹣23%= ×=
3+= 4×15%= = +50%=