0.01+10.099= 4.31×0.7= 7.5- 2.5= 5.4+1.89+4.6=
0.56+4.44= 2.9+3.7+2.1= 4×0.25= 1.25×5×8=
7.6×8+2.4×8= 7.2÷4 =
+x= x-(+)=1 -x=
3 和9 4和20
8.1-2.7= 3.6×2.5= 2÷0.5= 0.81+0.3=
0.32= 7.8a-2.3a-0.7a= - = + =
7÷12= 4÷6= 21÷49= 12.5×4=
5.5×200= 25÷0.05= 1.6÷3.2= 48×0.02=
1.79+8.11= 21.5+9.5= 2.5×0.4= 2-0.01=
0.48÷0.05= 0.47÷0.001= 12.5×1.6= 0.032=
①0.4x=3.6
②x﹣x=70
③1.6:x=0.8:0.4
④=