(和平区)直接写得数:2010﹣160= ,1÷= ,×2.5=,÷3=73.5﹣3.96=, ÷=, +=, ÷0.75=
计算54+99×99+45
计算9+99+999+9999+99999
42:=x:
x-x=
×7+×7