①14.5-(7又8/7-6又20/17)-2.125 ②3又5/3×25又5/2+37.9×6又5/2
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①14.5-(7又8/7-6又20/17)-2.125
=14.5+6.85-(7.875+2.125)
=21.35-10
=11.35
②3又5/3×25又5/2+37.9×6又5/2
=3.6×25.4+37.9×6.4
=3.6×25.4+25.4×6.4+12.5×6.4
=(3.6+6.4)×25.4+12.5×8×0.8
=10×25.4+100×0.8
=254+80
=334
=14.5+6.85-(7.875+2.125)
=21.35-10
=11.35
②3又5/3×25又5/2+37.9×6又5/2
=3.6×25.4+37.9×6.4
=3.6×25.4+25.4×6.4+12.5×6.4
=(3.6+6.4)×25.4+12.5×8×0.8
=10×25.4+100×0.8
=254+80
=334
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