计算下面各题.(能简便的要用简便方法计算)800-600÷20 18×(537-488) 720÷16÷5 329-186-14
计算下面各题.(能简便的要用简便方法计算)800-600÷2018×(537-488)720÷16÷5329-186-1425×37×419+199+1999+19999...
计算下面各题.(能简便的要用简便方法计算)800-600÷20 18×(537-488) 720÷16÷5 329-186-14 25×37×4 19+199+1999+19999.
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(1)800-600÷20,
=800-30,
=770;
(2)18×(537-488),
=18×49,
=882;
(3)720÷16÷5,
=720÷(16×5),
=720÷80,
=9;
(4)329-186-14,
=329-(186+14),
=329-200,
=129;
(5)25×37×4,
=25×4×37,
=100×37,
=3700;
(6)19+199+1999+19999,
=(20-1)+(200-1)+(2000-1)+(20000-1),
=(20+200+2000+20000)-(1+1+1+1),
=22220-4,
=22216.
=800-30,
=770;
(2)18×(537-488),
=18×49,
=882;
(3)720÷16÷5,
=720÷(16×5),
=720÷80,
=9;
(4)329-186-14,
=329-(186+14),
=329-200,
=129;
(5)25×37×4,
=25×4×37,
=100×37,
=3700;
(6)19+199+1999+19999,
=(20-1)+(200-1)+(2000-1)+(20000-1),
=(20+200+2000+20000)-(1+1+1+1),
=22220-4,
=22216.
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