①1264008126万
②13900000139万
③32亿3210000000
④1209000000001208亿
⑤500005亿
⑥34万340000
22×9+2=200
33×9+3=300
44×9+4=400
55×9+5=
×9+=600
×9+=900
①0.4x=3.6
②x﹣x=70
③1.6:x=0.8:0.4
④=