Question

Thực hiện phép tính bằng cách hợp lí

a)53.(-15)+(-15).47

b)-43.92-46.27+46.41

c)-72(15-49)+15(-56+72)

d)(-2⁴).17.(-3)⁰.(-5)⁶.(-1²ⁿ)  (n\(\in\)N)

Answer 1

a)53.(-15)+(-15).47

=(53+47).(-15)

=100.(-15)

=-1500

Answer 2

a) 53.(-15)+(-15).47

=53.[(-15)+(-15)].47

=53.(-30).47

=-1590.47

=-74730

Answer 3

53 . ( - 15 ) + ( - 15 ) . 47

= ( - 15 ) . ( 53 + 47 )

= - 15 . 100

= - 1500

Answer 4

a,

53.(-15) + (-15).47

= (-15).(53 + 47)

= -15.100

= -1500

b,

-43.92 - 46.27 + 46.41

= -43.92 - 46.(27 - 41)

= -86.46 - 46.(-14)

= 46.(-86 -14)

= 46.(-100)

= -4600

c,

-72(15 - 49) + 15(-56 + 72)

= -72.15 + 72.49 - 56.15 + 72.15

= 56(63 - 15)

= 2688

d,

(-24).17.(-3)0.(-5)6.(-12n)

= (-24).17.(-56)

= 4250000

Answer 5

a)-1500

b)-3312

c)2688

Answer 6

a. -1500

b. -3312

c. 2688

Answer 7

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Answer 8

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