(463-287)+408÷17简便运算
用简便方法计算.487-(287+78)346÷125÷827×44+27×56655×87+14×655-65587×995×17×4...
用简便方法计算. 487-(287+78) 346÷125÷8 27×44+27×56 655×87+14×655-655 87×99 5×17×4
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(1)487-(287+78)
=487-287-78
=200-78
=122;
(2)346÷125÷8
=346÷(125×8)
=346÷1000
=0.346;
(3)27×44+27×56
=27×(44+56)
=27×100
=2700;
(4)655×87+14×655-655
=655×(87+14-1)
=655×100
=65500;
(5)87×99
=87×(100-1)
=87×100-87×1
=8700-87
=8613;
(6)5×17×4
=5×4×17
=20×17
=340.
=487-287-78
=200-78
=122;
(2)346÷125÷8
=346÷(125×8)
=346÷1000
=0.346;
(3)27×44+27×56
=27×(44+56)
=27×100
=2700;
(4)655×87+14×655-655
=655×(87+14-1)
=655×100
=65500;
(5)87×99
=87×(100-1)
=87×100-87×1
=8700-87
=8613;
(6)5×17×4
=5×4×17
=20×17
=340.
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