fp_decs(places)
answer = fp_add(number1, number2[, decimals])
answer = fp_sub(number1, number2[, decimals])
answer = fp_mul(number1, number2[, decimals])
answer = fp_div(number1, number2[, decimals])
answer = fp_div(number1, number2[, decimals])
answer = fp_pow(number,power[, decimals])
answer = fp_rnd(number, type, digit[, decimals])