(1)如果100x²+kxy+49y²=(10x-7y)²,那么k=______ (2)因式分解202²+202×196+98² (a-b)²-4(b-a)+4
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(1)如果100x²+kxy+49y²=(10x-7y)²,那么k=______ (2)因式分解202²+202×196+98² (a-b)²-4(b-a)+4
(1)如果100x²+kxy+49y²=(10x-7y)²,那么k=______
(2)因式分解202²+202×196+98² (a-b)²-4(b-a)+4
(1)如果100x²+kxy+49y²=(10x-7y)²,那么k=______ (2)因式分解202²+202×196+98² (a-b)²-4(b-a)+4
(1)拆开100x²+kxy+49y²=100x²-140xy+49y²
两边比较
k=-140
(2)202²+202x196+98²
=(202+98)²
(a-b)²-4(b-a)+4
(a-b)²+4(a-b)+4
=(a-b+2)²
(1)如果100x²+kxy+49y²=(10x-7y)²=100x^2-140xy+49y^2
那么k=__-140____
(2)因式分解202²+202×196+98²
=(202+98)^2
=90000
(a-b)²-4(b-a)+4
=(a-b)²+4(a-b)+4
=(a-b+2)^2