5 12 ×[(1- 5 8 )× 5 6 ] 1 9 (2+0.5)×1.2-0.6÷ 27 5
512×[(1-58)×56]19(2+0.5)×1.2-0.6÷275371×539+248000×0.371+2130×37.140.2×8.1×45÷(0.8×81...
5 12 ×[(1- 5 8 )× 5 6 ] 1 9 (2+0.5)×1.2-0.6÷ 27 5 371×539+248000×0.371+2130×37.1 40.2×8.1× 4 5 ÷(0.8×81×20.1) 1990×1999-1989×2000 363+411×362 363×411-48 .
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(3)371×539+248000×0.371+2130×37.1, =371×539+248×371+213×371, =(539+248+213)×371, =1000×371, =371000; (4) 40.2×8.1×
=40.2×8.1×0.8÷0.8÷81÷20.1,, =(40.2÷20.1)×(8.1÷81)×(0.8÷0.8), =2×0.1×1, =0.2; (5)1990×1999-1989×2000, =1990×(2000-1)-1989×2000, =1990×2000-1990-1989×2000, =2000×(1990-1989)-1990, =2000-1990, =10; (6)
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