20600200060 80万80000
25230万25320万 6900000690万
50630000000=亿 420478000000≈亿
①147×45=
②208×35=
③※240×38=
④782÷78=
⑤7200÷600=
⑥※485÷64=1
905﹣260= =
= =
1.25×2.5×32= 8÷0.01=
808÷88≈ 697+296≈