运用公式法计算:(181²-61²)÷(301²-181²)

运用公式法计算:(181²-61²)÷(301²-181²)
运用公式法计算:(181²-61²)÷(301²-181²)

运用公式法计算:(181²-61²)÷(301²-181²)
(181²-61²)÷(301²-181²)
=(181+61)(181-61)÷(301+181)(301-181)
=242x120÷(482x120)
=242÷482
=121/241

a²-b²=(a-b)(a+b)
(181²-61²)÷(301²-181²)
=(181-61)(181+61) ÷[(301-181)(301+181)]
=120*242÷[120*482]
=242÷482
=121/241

(181²-61²)÷(301²-181²)
=(181+61)(181-61)÷(301+181)(301-181)
=242×120÷(482×120)
=242÷482
=121/241

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(181²-61²)÷(301²-181²)
=(181+61)(181-61)÷(301+181)(301-181)
=242×120÷(482×120)
=242÷482
=121/241