1×8+1=9
12×8+2=98
123×8+3=987
…
①35124+245167=
②9125467-564621=
③564621×9=
④5654869+25461-12456=
⑤26544×5+65012=
⑥564879亿-124569亿=
⑦254618万+564789万=
⑧6523145×6-123456=
⑨5641287×5=
⑩124659879-25641+65874=
⑪567×89+345 =
⑫689+8544÷89 =
⑬907-2295÷27 =
⑭2352÷(387-363) =
⑮1792÷(448÷16) =
⑯178×(3087÷49) =
①1000-264-136
②25×44
③36+[(234-178)×19]
1800-799= ×0= 354+147≈
10-10%= 3.6 +1.8= ×5.6= 723÷89≈
2÷= 12.3+7 = 0.23= 0.125×17×8=