4. а= 5×0+2= 2
а= 5×3+2= 17
а= 5×8+2= 42
а= 5×20+2= 102
5. Р∆= а+(b×2)= 10+(8×2)= 26см.
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4. а= 5×0+2= 2
а= 5×3+2= 17
а= 5×8+2= 42
а= 5×20+2= 102
5. Р∆= а+(b×2)= 10+(8×2)= 26см.