Toán tìm x biết: a/2,25 x X + X 7,75 = 2: 0,1 b/x = 2+4+8+16+….+512 14/09/2021 By Alice tìm x biết: a/2,25 x X + X 7,75 = 2: 0,1 b/x = 2+4+8+16+….+512
a, 2,25 x x+ x x 7,75= 2: 0,1 ( 2,25+ 7,75)x x= 20 10 x x= 20 x= 20: 10 x= 2 Vậy x= 2 b. x= 2+ 4+8+ 16+…..+ 512 2.x= 2.( 2+ 4+ 8+ 16+…+ 512) 2.x= 4+ 8+…..+ 1024 2.x- x= (4+ 8+…..+ 1024)- (2+ 4+8+ 16+…..+ 512) x= 1024- 2 x= 1022 Vậy x= 1022 Chúc em học tốt! Trả lời
a,2.25xX+X7.75=2:0.1 Xx 10 =20 x =20:10 x =2 b,x=2+4+8+16+……+512 2x=4+8+16+32+….+1024 x=2x-x=( 4+8+32+….1024) -( 2+4+8+16+…..512) x=1024-2 x=1022 Trả lời
a, 2,25 x x+ x x 7,75= 2: 0,1
( 2,25+ 7,75)x x= 20
10 x x= 20
x= 20: 10
x= 2
Vậy x= 2
b. x= 2+ 4+8+ 16+…..+ 512
2.x= 2.( 2+ 4+ 8+ 16+…+ 512)
2.x= 4+ 8+…..+ 1024
2.x- x= (4+ 8+…..+ 1024)- (2+ 4+8+ 16+…..+ 512)
x= 1024- 2
x= 1022
Vậy x= 1022
Chúc em học tốt!
a,2.25xX+X7.75=2:0.1
Xx 10 =20
x =20:10
x =2
b,x=2+4+8+16+……+512
2x=4+8+16+32+….+1024
x=2x-x=( 4+8+32+….1024) -( 2+4+8+16+…..512)
x=1024-2
x=1022