1÷0.25= +1 = ×24= + =
400×0.02= 10÷ = 6 ×0= 3× ﹣ ×3=
0.57+4.3=
×=
73×101=
-=
2.4÷0.1=
2.6×-×0.6=
0.7﹣ = × = + =
15÷ = ( + )×6= 1.25× ×8=
120-98= 0.25×0.4= + = 5÷100=
4+5.6= × = ×11- = + ×2=
我们知道:
(100+98)×(100-98)=1002-982。
(x+y)×(x-y)=( )
改正: