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5/9%5/16X7/9简便计算

71又15/16x(-8)=(72-1/16)*(-8)=72*(-8)-1/16*(-8)=-9+1/2=-8又1/2

5/9-7/16x5/9=5/9x(1-7/16)=5/9x9/16=5/16

你好!5/7*21/5*16=3*16=48 仅代表个人观点,不喜勿喷,谢谢.

9/16x1/3x4/5=3/16x4/5=3/206/5x0.125÷7/24=6/5x1/8x24/7=6/5x3/7=18/355/7x5/9+5/9x2/7=(5/7+2/7)x5/9=1x5/9=5/9

11/16x5+5/16x9=5/16x(11+ 9)=5/16*20=25/4

(2/3+5/12)x12=2/3*12+5/12*12=8+5=135/9x(8/13x9/10)=(5/9*9/10)*8/13=1/2*8/13=4/132/9-7/16x2/9=(1-7/16)*2/9=9/16*2/9=1/811/8x4/7-0.375x4/7=11/8*4/7-3/8*4/7=(11/8-3/8)*4/7=1*4/7=4/7

①1/2x1/15+1/3x1/2=1/2*(1/15+1/3)=1/2*(1/15+5/15)=1/2*6/15=1/2*2/5=1/5 ②5/6x5/9+5/9x1/6=5/9*(5/6+1/6)=5/9*1=5/9 ③3/9x7/16x2/9=1/3*7/8*1/9=7/216 ④2/5x4x3/4=2/5*1*3=6/5 ⑤4/5x7/9x8/5=224/225 ⑥5/7x16x1/5=1/7*16=16/7

①1/2X1/15+1/3X1/2=1/2*1/3*(1/5+1)=1/6*6/5=1②5/6X5/9+5/9X1/6=1/6*5/9*(5+1)=5/9③3/9X7/16X2/9=1/3*7/8*1/9=7/216④2/5X4X3/4=2/5*3=6/5=1又1/5⑤4/5X7/9X8/5=224/225⑥5/7X16X1/5=1/7*16*1=16/7=2又4/7

等于 九减七的差乘7/16

(16-9)x5=7x5=35

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