① + +
②
③
④
⑤ -( - )
⑥ +( - )
+=
-=
3-=
0.8+=
×18=
×=
3.2×=
4.5+5=
0.36÷0.12=
0.03÷0.1=
1.25×0.8=
5.62-5.6=
0.2×0.3=
a-0.8a =
0.9x+0.1x=
8和9
6和24
30和45
0.56÷0.8= = = =
5×( )= 30×= 0.53= 3﹣=