(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2

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(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2(17/20+14.15

(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2
(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2

(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2
(17/20+14.15)*[1-(-1/2)÷7/8]-(-2)^3*(-1/2)^2
=15*[1+4/7]+8*1/4
=15*11/7+2
=23又4/7+3
=25又4/7