0.25×3/8+1/4×1/8+2.75×1/2的简便方法是什么？ 5
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先换算成分数再计算，原式=1/4×3/8+1/4×1/8+275/100×1/2=1/4（3/8+1/8）+11/4×1/2=1/4×1/2+11/4×1/2=1/2×（1/4+11/4）=3/2就是1又1/2
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=0.25×3/8+0.25×1/8+2.75×1/2
=0.25×(3/8+1/8)+2.75×1/2
=0.25×1/2+2.75×1/2
=(0.25+2.75)×1/2
=3×1/2
=1.5
=0.25×(3/8+1/8)+2.75×1/2
=0.25×1/2+2.75×1/2
=(0.25+2.75)×1/2
=3×1/2
=1.5
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合并同类项啊，
原式=1/4(3/8+1/8)+2.75×1/2
=1/4×1/2+2.75×1/2
=1/2(0.25+2.75)
=1/2×3
=1.5
原式=1/4(3/8+1/8)+2.75×1/2
=1/4×1/2+2.75×1/2
=1/2(0.25+2.75)
=1/2×3
=1.5
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解:0.25ⅹ3/8+1/4x1/8+2.75x1/2=(0.25+2.75)ⅹ3/8+1/4ⅹ1/8x1/2=3ⅹ3/8+1/4ⅹ1/8X1/2=3ⅹ(3/8x1/8)+(1/4ⅹ1/2=3ⅹ4/8+1/8=3x4/8+6/8=12/8+6/8=18/8=9/4
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