0.5+4.5x=45.5
0.8+1.7-x=1.73
2(x-3)=11.6
1.8×3=
2.4×0.5=
5.1÷0.3=
0.9×0.6=
0.56÷0.7=
0.6²=
0.42÷0.6=
1÷0.01=
2.6÷0.02=
2.5-2.5÷5=
①4.1÷2 ②3÷0.99 ③0.99×0.99 ④3.01÷1.98