①665×8=
②890×7=
③309×6=
④520×5=
⑤480-85=
⑥1000—699=
⑦359+471=
⑧755+155=
①700﹣1.5÷7×30
②14.1﹣4.63+1.6﹣2.37
③(+)×9+
④÷[×(﹣)]