
2个回答
展开全部
(0.25+2.5+25)×(4-0.4)
=(0.25+2.5+25)×3.6
=(0.25+2.5+25)×4×0.9
=0.25×4×0.9+2.5×4×0.9+25×4×0.9
=0.9+9+90
=99.9
=(0.25+2.5+25)×3.6
=(0.25+2.5+25)×4×0.9
=0.25×4×0.9+2.5×4×0.9+25×4×0.9
=0.9+9+90
=99.9
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