Question

bai 46 trang 26 sgk toan 7 tap 1

Answer 1

b) -0,52 :x =-9,36 : 16,38

=> -0,52 .16,38 = x.(-9,36)

=> x = -8,5176 : (-9,36) = 0,91

=> 34 : 23 = x: 1,61

=> 23x = 34.1,61

=> x = 54,74 : 23 =2,38

Answer 2

a,\(\dfrac{x}{27}=-\dfrac{2}{3,6}\)

=>3,6x=-2.27

=>3,6x=-54

=>x=-54:3,6

=>x=-15

Vậy x=-15

b,-0,52:x=-9,36:16,38

=>-0,52.16,38=-9,36x

=>-8,5176=-9,36x

=>x=-8,5176:(-9,36)

=>x=0,91

Vậy x=0,91

c,\(\dfrac{4\dfrac{1}{4}}{2\dfrac{7}{8}}=\dfrac{x}{1,61}\)

=>\(4\dfrac{1}{4}:2\dfrac{7}{8}=\dfrac{x}{1,61}\)

=>\(\dfrac{17}{4}:\dfrac{23}{8}=\dfrac{x}{1,61}\)

=>\(\dfrac{17}{4}.\dfrac{8}{23}=\dfrac{x}{1,61}\)

=>\(\dfrac{34}{23}=\dfrac{x}{1,61}\)

=>23x=34.1,61

=>23x=54,74

=>x=2,38