①9.81×10％+1/2×98.1+0.049×981②1.25×2.5×32③1.8-1÷﹙0.75+1/3﹚×1又5/8
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①9.81×10％+1/2×98.1+0.049×981
=9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5*9.81+4.9×9.81
=9.81×（0.1+5+4.9）
=9.81×10=98.1
②1.25×2.5×32
=1.25×2.5×4×8
=1.25×8×2.5×4
=10×10
=100
③1.8-1÷﹙0.75+1/3﹚×1又5/8
=1.8-1÷(13/12)×(13/8)
=1.8-1×(12/13)×(13/8)
=1.8-1×(3/2)
=0.3
=9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5*9.81+4.9×9.81
=9.81×（0.1+5+4.9）
=9.81×10=98.1
②1.25×2.5×32
=1.25×2.5×4×8
=1.25×8×2.5×4
=10×10
=100
③1.8-1÷﹙0.75+1/3﹚×1又5/8
=1.8-1÷(13/12)×(13/8)
=1.8-1×(12/13)×(13/8)
=1.8-1×(3/2)
=0.3
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