脱式计算(能用简便方法的就用简便方法计算) ①169÷13+124×5 ②243+26+274 ③35.24-(15.24
脱式计算(能用简便方法的就用简便方法计算)①169÷13+124×5②243+26+274③35.24-(15.24+8.16)④354-99⑤85.07-(15.3-4...
脱式计算(能用简便方法的就用简便方法计算) ①169÷13+124×5 ②243+26+274 ③35.24-(15.24+8.16) ④354-99 ⑤85.07-(15.3-4.8)+5.6 ⑥83×5+83×2+83×3.
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①169÷13+124×5,
=13+620,
=633;
②243+26+274,
=243+(26+274),
=243+300,
=543;
③35.24-(15.24+8.16),
=35.24-15.24-8.16,
=20-8.16,
=11.84;
④354-99,
=354-100+1,
=254+1,
=255;
⑤85.07-(15.3-4.8)+5.6,
=85.07-10.5+5.6,
=74.57+5.6,
=80.17;
⑥83×5+83×2+83×3,
=83×(5+2+3),
=83×10,
=830.
=13+620,
=633;
②243+26+274,
=243+(26+274),
=243+300,
=543;
③35.24-(15.24+8.16),
=35.24-15.24-8.16,
=20-8.16,
=11.84;
④354-99,
=354-100+1,
=254+1,
=255;
⑤85.07-(15.3-4.8)+5.6,
=85.07-10.5+5.6,
=74.57+5.6,
=80.17;
⑥83×5+83×2+83×3,
=83×(5+2+3),
=83×10,
=830.
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