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7x9x(6/7一1/9)怎么简算?

7*9*(5/6-1/9) =7*9*5/6-7*9*1/9 =105/2-7 =91/2

=(1-6)X(1-15)X(1-27/2)X(1-63/5)X(1-4)X(1-27/7)X(1-15/4)X(1-11/3) =5X14X(1-27/2)X(1-63/5)X3X(1-27/7)X(1-15/4)X(1-11/3) =5X(1-63/5)X2X(1-27/2)X7X(1-27/7)X3X(1-11/3)X(1-15/4) =(-58)X(-25)X(...

-63800

=1/2×(1-1/3+1/3-1/5+1/5-1/7+17-1/9+1/9-1/11) =1/2×(1-1/11) =1/2×10/11 =5/11

1 / (5x7) +1 / (7x9) +1 / (9x11)+ 1 / (11x13)+ 1 / (13x15) =1/2×(1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15) =1/2×(1/5-1/15) =1/15

干嘛表达的这么麻烦,看了第一题就没耐心了,第一题,1/6*9/4-2/5*3/4=3/8-3/10=3/40

201╳0.67一1.9x67 =67*【2.01-1.9】 =67*0.11 =67*0.1+67*0.01 =6.7+0.67 =7.37 满意采纳奥

分子 =10.5X11.7X57X85=(0.5X3X7)X(0.3X3X13)X(3X19)X(5X17) 分子=1.7X1.9X3X5X7X9X11X13X15=1.7X1.9X3X5X7X(3X3)X11X13X(5X3) 因此原式通分得 原式=1/11

2/9-7/16x2/9 =2/9x(1-7/16) =2/9x9/16 =2/16 =1/8 9/2-16/7x9/2 =9/2x(1-16/7) =9/2x(-9/7) =-81/14 谢谢,请采纳

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