Jawabanmu

2014-01-29T09:10:39+07:00
U1=2x+1, U50=2x+50
S50=4275
S50= \frac{1}{2} . 50 (U1+U50)
4275= \frac{1}{2} . 50 (2x+1+2x+50)
4275=25(4x+51)
171=4x+51
171-51=4x
120=4x
x=30
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