①0.8=
②10=
③3.200=
④0.04000=
⑤7.8=
⑥9.5000=
= =
①79+113+21+87
②2600÷25÷4
③(169+314)-315÷9
④28.63+15.4-8.63
⑤53×36+36×47
⑥4.88-2.34+5.12-1.66
204万20450000 8170005008亿
250×40125×80 99×9910000