$$( \frac { 7 } { 8 } ) ^ { 0 } - ( \frac { - 5 } { 7 } ) ^ { 0 } + ( \frac { 4 } { 9 } ) ^ { 0 }$$
$1$
$$1-\left(\frac{-5}{7}\right)^{0}+\left(\frac{4}{9}\right)^{0}$$
$$1-\left(-\frac{5}{7}\right)^{0}+\left(\frac{4}{9}\right)^{0}$$
$$1-1+\left(\frac{4}{9}\right)^{0}$$
$$0+\left(\frac{4}{9}\right)^{0}$$
$$0+1$$
$$1$$
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