703×4=2852.
63÷9=
125×8=
150×2=
(32-32)×9=
482+38= 140×6= 144+56= 390+430=
560×2= 88×4= 400×3= 90-27=
+ = 1- = + = - =
①96×4
②905×9
③417+283
验算:
④670×7
⑤378×6
⑥821-97