计算下面各题,能简便的要简便运算34×99+34 4.83-2.56+15.17 (40+8)×25 68×29+32×29 17.68-
计算下面各题,能简便的要简便运算34×99+344.83-2.56+15.17(40+8)×2568×29+32×2917.68-(4.68+7.2)102×45(280...
计算下面各题,能简便的要简便运算34×99+34 4.83-2.56+15.17 (40+8)×25 68×29+32×29 17.68-(4.68+7.2)102×45 (280÷4+15)×2 480÷(35-19)×17.
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(1)34×99+34,
=34×(99+1),
=34×100,
=3400;
(2)4.83-2.56+15.17,
=(4.83+15.17)-2.56,
=20-2.56,
=17.44;
(3)(40+8)×25,
=(40+8)×25,
=40×25+25×8,
=1000+200,
=1200;
(4)68×29+32×29,
=(68+32)×29,
=100×29,
=2900;
(5)17.68-(4.68+7.2),
=(17.68-4.68)-7.2,
=13-7.2,
=5.8;
(6)(280÷4+15)×2,
=(70+15)×2,
=140+30,
=170;
(7)480÷(35-19)×17,
=480÷16×17,
=30×17,
=510;
(8)102×45,
=(100+2)×45,
=4500+90,
=4590.
=34×(99+1),
=34×100,
=3400;
(2)4.83-2.56+15.17,
=(4.83+15.17)-2.56,
=20-2.56,
=17.44;
(3)(40+8)×25,
=(40+8)×25,
=40×25+25×8,
=1000+200,
=1200;
(4)68×29+32×29,
=(68+32)×29,
=100×29,
=2900;
(5)17.68-(4.68+7.2),
=(17.68-4.68)-7.2,
=13-7.2,
=5.8;
(6)(280÷4+15)×2,
=(70+15)×2,
=140+30,
=170;
(7)480÷(35-19)×17,
=480÷16×17,
=30×17,
=510;
(8)102×45,
=(100+2)×45,
=4500+90,
=4590.
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