4x+6x=26 5×8+5x=80 x-4.9+2.1=10
+=
-=
1-=
4+=
⑴0.53=
⑵52×6=
⑶0.49÷0.7=
⑷1.2×0.03=
⑸11÷12=
⑹12÷0.01=
⑺1.01﹣0.09=
⑻7÷5=
①
②
③
④