能简算的要简算 1/4*0.8+1/2÷3/4-0.8 (3/4+3/8)÷(8/15-0.45) 0.25÷(1-5/9)+3/8
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1/4*0.8+1/2÷3/4-0.8
=1/2×4/3-(1-1/4)*0.8
=2/3-3/5
=1/15
(3/4+3/8)÷(8/15-0.45)
=9/8÷1/12
=13.5
0.25÷(1-5/9)+3/8
=0.25÷4/9+3/8
=9/16+3/8
=15/16
=1/2×4/3-(1-1/4)*0.8
=2/3-3/5
=1/15
(3/4+3/8)÷(8/15-0.45)
=9/8÷1/12
=13.5
0.25÷(1-5/9)+3/8
=0.25÷4/9+3/8
=9/16+3/8
=15/16
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