15×80=
150×8=
150×80=
540709000005470900000 48万480001
8000000008亿 2000002000000
21×126= 205×18=
820÷41= 542÷74
8+39= 69÷3= 400×9= 2.6+0.7=
18﹣2.5= + = ×5= 20× =
0.356×100= 4÷28= 15: = 98×12≈