①100 –x=250
②8x-5x=2.1※
③3x+4=40
④2(x-16)=8※
8.1÷0.9=
0.65÷1.3=
0.45÷3=
0.36×3=
21.9÷7.3=
0.32÷1.6=
8÷5=
8.5÷2=
1.5÷3×0.2 2.07÷2.5÷4
(2.8+1.47)÷0.7 1.8+3.2÷2
0.5×0.9=
7.8÷0.3=
0.2÷0.02+9.5=
50×0.02=
9.1÷10=
5.6÷0.08=
2.8+0.35+0.5=
23.8÷1.7
=(23.8×10)÷(1.7×)
=÷
=