
2个回答
展开全部
7/8*0.25+1/4+1/8*0.25
=(7/8+1/8)*1/4+1/4
=1/4+1/4
=1/2
49.5*13.5+50.5*13-0.5*49.5
=49.5*(13.5-0.5)+50.5*13
=49.5*13+50.5*13
=(49.5+50.5)*13
=100*13
=1300
=(7/8+1/8)*1/4+1/4
=1/4+1/4
=1/2
49.5*13.5+50.5*13-0.5*49.5
=49.5*(13.5-0.5)+50.5*13
=49.5*13+50.5*13
=(49.5+50.5)*13
=100*13
=1300
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