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47.5×0.25+1/4 ×52.5
=47.5×0.25 +0.25×52.5
=0.25×（47.5+52.5）
=0.25×100
=25
2/3 +（1/3+1/2）×4/5
=2×1/3+1/3×4/5+1/2×4/5
=1/3×（2+4/5）+2/5
=1/3×14/5 +2/5
=14/15+2/5
=14/15+6/15
=20/15
=4/3
1.43+2.87-0.43
=1.43-0.43+2.87
=1+2.87
=3.87
=47.5×0.25 +0.25×52.5
=0.25×（47.5+52.5）
=0.25×100
=25
2/3 +（1/3+1/2）×4/5
=2×1/3+1/3×4/5+1/2×4/5
=1/3×（2+4/5）+2/5
=1/3×14/5 +2/5
=14/15+2/5
=14/15+6/15
=20/15
=4/3
1.43+2.87-0.43
=1.43-0.43+2.87
=1+2.87
=3.87
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