Question

[Sky Mon]

Bài 1 : Tính hợp lý (3 tick) :

a) 31 × (-125) + 225 × 31

b) 26 × (-125) – 125 × (-36)

c) 29 × (-13) + 27 × (-29) + (-14) × (-29)

d) 17 × (-37) – 23 × 37 – 46 × (-37)

Answer 1

[nguyen duc thang]

a ) 31 x ( - 125 ) + 225 x 31 

= 31 x [ ( - 125 ) + 225 ]

= 31 x 100

= 3100

b ) 26 x ( - 125 ) - 125 x ( - 36 )

= ( - 26 ) x 125 - 125 x ( - 36 )

= 125 x [ ( - 26 ) - ( - 36 ) ]

= 125 x 10

= 1250

Answer 2

[➻❥ɴт_тнủʏ︵²⁰⁰⁴]

a) 31 × (-125) + 225 × 31

= 31 x ( -125 + 225 )

= 31 x 100

= 3100

b) 26 × (-125) – 125 × (-36)

= -125 ( 26 - 36 ) 

= 125x 10

= 1250

d) 17 × (-37) – 23 × 37 – 46 × (-37)

= -629 - 851 + 1702

= 1480