(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)急

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(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)急
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(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)急
(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)

(6又1/2)*(+4)+(4.28)*4又1/2-(-4.5)*(5.72)急
6½×4+4.28×4½-(-4.5)×5.72
原式=26+19.26-(-25.74)
=45.26+25.74
=71