脱式计算(能简算的要简算)2.4×58+84×1.2112÷55556438×3637817÷23+123×917429×[1-(34-38)].
除法
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①2.4×58+84×1.2
=2.4×58+42×2.4,
=2.4×(58+42),
=2.4×100,
=240;②38×3637
=(37+1)×3637,
=37×3637+1×3637,
=36+3637,
=363637;③429×[1-(34-38)]
=429×(1-38),
=429×58,
=558;④112÷555564
=112÷55×64+5564,
=112÷55×(64+1)64,
=112÷55×6564,
=112×6455×65,
=71683575.⑤817÷23+123×917
=817×123+123×917,
=123×(817+917),
=123×1,
=123.
