19+23=
5-1.6=
0.23÷0.1=
0.4×0.2=
=
10﹣5.2=
7÷=
4×0.5=
0.52÷0.42=
48÷0.04=
48×25%=
1÷1%=
3.5+6.45=
657﹣298=
2.4×=
562÷79≈
21×498≈
5x﹣3.6=20
355+445=
+ =
3.14÷0.1=
52+32=
× ×0=
× =
5 ÷5.25=
× + × =
+ + =
905﹣260= =
= =
1.25×2.5×32= 8÷0.01=
808÷88≈ 697+296≈
1÷12= 23+16= 78÷7= 4×715= 525+0.3=
5÷53= 16×38= 35﹣12= 0.36+0.4= 8×(12+0.5)=
△= ○= □=