初二下册数学书第23页第5题第（3）（4）过程
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⑶原式=3Y/2(X+Y)+2XY/X(X+Y)
=3(X+Y)/2(X+Y)+4Y/2(X+Y)
=7Y/2(X+Y)
⑷2原式=2X/(X+8Y)(X-8Y)-(X+8Y)/(X+8Y)(X-8Y)
=(X-8Y)/(X+8Y)(X-8Y)
=1/(X+8Y)。
=3(X+Y)/2(X+Y)+4Y/2(X+Y)
=7Y/2(X+Y)
⑷2原式=2X/(X+8Y)(X-8Y)-(X+8Y)/(X+8Y)(X-8Y)
=(X-8Y)/(X+8Y)(X-8Y)
=1/(X+8Y)。
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展开全部
⑶原式=3Y/2(X+Y)+2XY/X(X+Y)
=3(X+Y)/2(X+Y)+4Y/2(X+Y)
=7Y/2(X+Y)
⑷2原式=2X/(X+8Y)(X-8Y)-(X+8Y)/(X+8Y)(X-8Y)
=(X-8Y)/(X+8Y)(X-8Y)
=1/(X+8Y)。
=3(X+Y)/2(X+Y)+4Y/2(X+Y)
=7Y/2(X+Y)
⑷2原式=2X/(X+8Y)(X-8Y)-(X+8Y)/(X+8Y)(X-8Y)
=(X-8Y)/(X+8Y)(X-8Y)
=1/(X+8Y)。
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