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5/2一5/12一1/6 除以2/8用简便方法计算

2×1/6÷(5/8) =1/3x8/5 =8/15 这题没有简便方法

需要先通分: 5/12 = 10/24 1/6 = 4/24 3/8 = 9/24 所以: 5/12+1/6+3/8 = 10/24+4/24+9/24 = 23/24

(1)(-12)-(+8)+(-6)-(-5)=-12-8-6+5=-26+5=-21;(2)(-2)×(- 5 3 )-|-2 3 |-5÷6-( - 1 3 )=3 1 3 -8- 5 6 + 1 3 =2 5 6 -8=-5 1 6 ;(3)-(a-b)-3(b-2a)=-a+b-3b+6a=5a-2b;(4) 1 4 (-4x 2 +2x-8)-( 1 2 x -1)=-x ...

如图

如果帮到了你,请采纳,谢谢

约分可以使计算简便

2/7x8/5x1/6 =2/7x8/30 =1/7x8/15 =8/105 谢谢,请采纳

1.原式=1.2×198-98×1.2=1.2×(198-98)=1.2×100=120 另 2题后面是否有中括号 ?

201x45 =(200+1)x45 =200x45+1x45 =9000+45 =9045 24乘(3/8+1/6-1/12) =24x3/8+24x1/6-24x1/12 =9+4-2 =11

8.1*5.2*0.6 =5.2*4.86 =(5+0.2)*4.86 =24.3+0.972 =25.272

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