34x1.25 2.6x12.5 0.2x125的简便计算?
4个回答
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计算过程如下:首先,计算4个数值的和:∑Xs = 0.3 + 0.2 + 0.4 + 0.1 = 1然后,计算 lg-1(∑Xs/4):lg-1(∑Xs/4) = lg-1(1/4) = -1其中,lg表示以10为底的对数,即 log10。...
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34x1.25+2.6x12.5+0.2x125
=34x1.25+26x1.25+20x1.25
=(34+26+20)x1.25
=80x1.25
=100
=34x1.25+26x1.25+20x1.25
=(34+26+20)x1.25
=80x1.25
=100
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34x1.25
=(40-6)x1.25
=40x125/100-6x125/100
=5000/100-750/100
=50-7.5
=42.5
2.6x12.5
=(3-0.4)x12.5
=3x12.5-4x125/100
=37.5-500/100
=37.5-5
=32.5
0.2x125
=2x125/10
=250/10
=25
=(40-6)x1.25
=40x125/100-6x125/100
=5000/100-750/100
=50-7.5
=42.5
2.6x12.5
=(3-0.4)x12.5
=3x12.5-4x125/100
=37.5-500/100
=37.5-5
=32.5
0.2x125
=2x125/10
=250/10
=25
追答
34x1.25
=(40-6)x1.25
=40x125/100-6x125/100
=5000/100-750/100
=50-7.5
=42.5
2.6x12.5
=(3-0.4)x12.5
=3x12.5-4x125/100
=37.5-500/100
=37.5-5
=32.5
0.2x125
=2x125/10
=250/10
=25
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原式=34×1.25+26×1.25+20×1.25
=(34+26+20)×1.25
=80×1.25
=100
=(34+26+20)×1.25
=80×1.25
=100
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