用简便方法计算:25×125×4×8 37×28+37×2 (10+8)×125 173+428+27 38×101 36×25 58
用简便方法计算:25×125×4×837×28+37×2(10+8)×125173+428+2738×10136×2558×9920×477×5....
用简便方法计算:25×125×4×8 37×28+37×2 (10+8)×125 173+428+27 38×101 36×25 58×99 20×477×5.
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(1)25×125×4×8
=25×4×(125×8)
=100×1000
=100000;
(2)37×28+37×2
=37×(28+2)
=37×30
=1110;
(3)(10+8)×125
=10×125+8×125
=1250+1000
=2250;
(4)173+428+27
=173+27+428
=200+428
=628;
(5)38×101
=38×(100+1)
=38×100+38×1
=3800+38
=3838;
(6)36×25
=9×(4×25)
=9×100
=900;
(7)58×99
=58×(100-1)
=58×100-58
=5800-58
=5742;
(8)20×477×5
=20×5×477
=100×477
=47700.
=25×4×(125×8)
=100×1000
=100000;
(2)37×28+37×2
=37×(28+2)
=37×30
=1110;
(3)(10+8)×125
=10×125+8×125
=1250+1000
=2250;
(4)173+428+27
=173+27+428
=200+428
=628;
(5)38×101
=38×(100+1)
=38×100+38×1
=3800+38
=3838;
(6)36×25
=9×(4×25)
=9×100
=900;
(7)58×99
=58×(100-1)
=58×100-58
=5800-58
=5742;
(8)20×477×5
=20×5×477
=100×477
=47700.
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