712÷[34-(1112-12)]0.65×6.4-6.5×0.64+65×9%[459-(225+0.64)÷3125+56]×4.51-2+3-4+5-6+…+2009-2010+2011110×13+113×16+116×19+…+134×37112+216+3112+…+9190+101110.-数学
题文
0.65×6.4-6.5×0.64+65×9% [4
1-2+3-4+5-6+…+2009-2010+2011
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答案
(1)
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=
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(2)0.65×6.4-6.5×0.64+65×9%, =0.65×6.4-6.5×0.64+65×0.09, =0.65×6.4-0.65×6.4+0.65×9, =0.65×(6.4-6.4+9), =0.65×9, =0.65×(10-1), =6.5-0.65, =5.85;
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上一篇:2+4+6+8+10+12+14+16+18+20=()A.100B.110C.112D.120-数学
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