142×56-122×61的简便计算方法?
4个回答
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原式=142*56-122*(56+5)
=(142-122)*56-122*5
=1232-610
=622
=(142-122)*56-122*5
=1232-610
=622
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142×56-122×61
=142×56-122×(56+5)胡陪
=142×56-122×56-122×5
=(汪橘142-122)困做团×56-122×5
=20×56-61×2×5
=10×112-61×10
=(112-61)×10
=51×10
=510
=142×56-122×(56+5)胡陪
=142×56-122×56-122×5
=(汪橘142-122)困做团×56-122×5
=20×56-61×2×5
=10×112-61×10
=(112-61)×10
=51×10
=510
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142*56-122*61=142*56-122*(镇坦56+5)正悄=142*56-122*56-122*5=56*(142-122)举旅渣-5*122=56*20-5*122=1120-610=510
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展开全部
142×56-122×61
=142×56-122×(56+5)胡陪
=142×56-122×56-122×5
=(汪橘142-122)困做团×56-122×5
=20×56-61×2×5
=10×112-61×10
=(112-61)×10
=51×10
=510
=142×56-122×(56+5)胡陪
=142×56-122×56-122×5
=(汪橘142-122)困做团×56-122×5
=20×56-61×2×5
=10×112-61×10
=(112-61)×10
=51×10
=510
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