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4/7÷2计算

4/7÷2 =4/7×1/2 =2/7

1-4/7-4/7×1/2 =1-4/7-2/7 =1/7

请问这个怎么算? 2/5x3/7+4/7÷5/2 2/5x3/7+4/7÷5/2 =2/5*3/7+4/7*2/5 =2/5*(3/7+4/7) =2/5

原式=2+(-3)× 2 3 + 2 3 =2 3 .

4/8+3/5×(2/7÷(7/2))-3 =1/2+(3/5)x(4/49)-3 =1/2+12/245-3 =245/490+24/490-3 =269/490-3 =-2又490分之221

(1) 1/7=0.1428571428571 2/7 = 0.2857142857142 3/7 = 0.4285714285714 4/7 = 0.5714285714285 5/7 = 0.7142857142857 6/7 = 0.857142857142 8 保留了13位有效数字 (2) 5/7 = 0.7142857142857第34位是2 (1) 都是无限循环小数都是小数点后...

2x+2-x+5=7 x+7=7 x=0

3/4÷7/8÷15/14 =3/4*8/7*14/15 =4/5 (4/9+2/15)÷2/15 =4/9*15/2+1 =10/3+1 =4又1/3 3/20÷ 0.2×2/3 =3/20*5*2/3 =1/2

(1)17-8÷(-2)+4×(-3) 2 =17-(-4)+4×9=17+4+36=57;(2) (-4 7 8 )-(-5 1 2 )+(-4 1 4 )-(+3 1 8 ) = -4 7 8 +5 1 2 -4 1 4 -3 1 8 = (-4 7 8 -4 1 4 -3 1 8 )+5 1 2 = -12 1 4 +5 1 2 =-6 3 4 ;(3) ( 11 12 - 7 6 + 3 4 - 13 24 )×...

1-(5-7)÷(-3)³ =1+2÷(-27) =1-2/27 =25/27 17-8÷(-2)+4×(-5) =17+4-20 =1

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