Question

Bài 1 : Tìm y:

a) y - ( -42 - 2y ) = ( -12 ) - 14 + 2y

b) 15 - ( - y + 5 ) - 5y = - ( 12+ 5y)

c) 2y - ( -5 + 8y - 21 ) = -3 - ( 5y + 2 )

e) - 13 - ( - 3y - 23 ) = - ( 120 - y )

g) - 21 - ( -32 - 5y ) = - ( - 16 - 4y )

Bài 2 :

a) ( - 5 ) x 6 + 15 x 6

b) 9 x ( - 3 ) + 9 x 23

c) ( -10) x 11 + 210 x 11

d) 125 x 4 - 125 x (-4)

Answer 1

Bài 2:

a: =6(15-5)=6*10=60

b: =9(-3+23)=9*20=180

c: =11(-10+210)=11*200=2200

d: =125*4+125*4=125*8=1000