16题,加算式…
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16题,加算式…16题,加算式… 16题,加算式…原式=x+3y-3xy+4x+2y-2xy=5x+5y-5xy=5(x+y-xy)将x+y=1/3,xy=-1/2代入即5(x+y-xy)=
16题,加算式…
16题,加算式…
16题,加算式…
原式=x+3y-3xy+4x+2y-2xy
=5x+5y-5xy
=5(x+y-xy)
将x+y=1/3 ,xy=-1/2代入
即5(x+y-xy)=5(1/3+1/2)=25/6
