Tìm x: 9 x X – 5 x ( X + 3 ) = 137 Tính nhanh 20,1 x 134,77 + 6,7 x 24,6 x 3 – 6 x 59,37 x 3,35

1 bình luận về “Tìm x: 9 x X – 5 x ( X + 3 ) = 137 Tính nhanh 20,1 x 134,77 + 6,7 x 24,6 x 3 – 6 x 59,37 x 3,35”

1. 9 xx x – 5 xx (x+3)=137

   9 xx x – 5 xx x – 5 xx 3=137

   9 xx x – 5 xx x – 15=137

   4 xx x -15 =137

   4 xx x =137+15

   4 xx x =152

   x=152:4

   x=38

   ========

   20,1 xx 134,77+6,7xx24,6xx3-6xx59,37xx3,35

   =20,1 xx 134,77 + (6,7 xx 3)xx24,6-(6xx3,35)xx59,37

   =20,1xx134,77+20,1xx24,6-20,1xx59,37

   =20,1xx(134,77+24,6-59,37)

   =20,1xx(159,37-59,37)

   =20,1xx100

   =2010

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