3-1=
×1.6=
0.8÷0.01=
(0.25++)×8=
1÷1=
0.6÷=
4-1÷3-8×=
0.1×0.1+0.1÷0.1=
①
②
③2.1x+7.9x=0.29
④12∶7=x∶0.3
①[3.2×(1-)+3]×2
③×99
④3.75×4+1.6×3
⑤1÷2.5+2.5×0.4
⑥3-1-