简便运算(1)40.7x9.9(2)26.7x53+26.7+26.7x46(3)5.08x98+ 50.8x0.2
(1)40.7x9.9=40.7x(10-0.1)=407-4.07=402.93
(2)
26.7x53+26.7+26.7x46
=26.7x53+26.7x1+26.7x46
=26.7x(53+1+46)
=26.7x(54+46)
=26.7x100
=2670
(3)
5.08x98+ 50.8x0.2
=50.8x9.8+50.8x0.2
=50.8x(9.8+0.2)
=50.8x10
=508
(2)
26.7x53+26.7+26.7x46
=26.7x53+26.7x1+26.7x46
=26.7x(53+1+46)
=26.7x(54+46)
=26.7x100
=2670
(3)
5.08x98+ 50.8x0.2
=50.8x9.8+50.8x0.2
=50.8x(9.8+0.2)
=50.8x10
=508
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第1个回答 2020-05-20
第2个回答 2014-03-30
=40.7*10-40.7*0.1
=407-4.07
=402.93
=26.7*(53+1+46)
=26.7*100=2670
=407-4.07
=402.93
=26.7*(53+1+46)
=26.7*100=2670
第3个回答 2020-12-09