487×8= 390×6= ★625÷3= ★762÷4=
3000+205=
461+250=
620-120=
2600-2000=
520×3=
400×5=
483+321≈
139×3≈
列式计算:
问题:
42-22=(4+2)×(4-2)=12
72-32=(7+3)×(7-3)=4092-42=(9+4)×(9-4)=65
152-52=(+)×(-)
①101×9.9
②44﹣72÷
③36×()
④÷[(﹣)×3]
⑤95×3.8+6.2÷
⑥0.25×40÷0.25×40