①35+58=
②43-25=
③29+35+16=
④83-8-60=
⑤35+28-47=
⑥71-(55-42)=
×8<50 34>5 × +18<32
1×1= 1×9=
11×11= 21×9=
111×111= 321×9=
1111×1111= 4321×9=
11111×11111= 54321×9=
111111×111111= 654321×9=
0.4÷0.2= 1÷= 406﹣299= a﹣a×0=