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7x9x(6/7一1/9)怎么简算?

5/7÷1/9十5/7-5/7x9 =5/7x9十5/7-5/7x9 =5/7x9-5/7x9十5/7 =5/7x(9-9)十5/7 =5/7

=(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(...

=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) 4x9=36 44x99=4356 444x999=443556 4444x9999=44435556 (2) 5x9=45 55x99=5445 555x999=554445 5555x9999=55544445 (3) 6x9=54 66x99=6534 666x999=665334 6666x9999=66653334 规律:n个6 *n个9=(n-1)个6 跟5 跟(n-1)个3 跟4 (4...

解:320%x[1-(1/4+1/6)]x9/20 =320x[1-(3/12+2/12)]x9/20 =320X(1-5/12)x9/20 =320x7/12x9/20 =(320x7x9)/(12x20) =(4x7x9)/3 =84 补充:解:320%x[1-(1/4+1/6)]x9/20 =320%x[1-(3/12+2/12)]x9/20 =320%X(1-5/12)x9/20 =320%x7/12x9/20 =(320%x...

通分 1/7+5/9 =9/63+35/63 =44/63

-1/10,分子、分母相约分

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

1/(7×9)+ 1/(9×11)+ 1/(11×13) +1/(13×15) =½×(1/7 -1/9 +1/9- 1/11+ 1/11- 1/13 +1/13 -1/15) =½×(1/7 -1/15) =½×8/105 =4/105

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