Question

Thực hiện phép tính :

a) 53.123 – 53.23

b) (42 – 98) - (42 -12) - 12

c) [(1919 :	1918	-17).1000 -1989].13.(-1)2012	2012	- (-13)	2	.(-2020)0

Answer 1

a) 53.123 - 53.23

=> 53.(123 - 23)

=> 53 .100 = 5300

b) (42 - 98) - (42 - 12) - 12

=> 42 - 98 - 42 + 12 - 12

=>( 42 - 42 ) + ( 12 - 12) - 98

=> 0 + 0 - 98 = -98

c) [(\(19^{19}:19^{18}-17\) ) . 1000 - 1989] . 13.(-1)\(^{2012}\) - (-13)\(^2\) .(-2020)\(^0\)

=> [(19-17).1000 - 1989].13.1+169.1

=> [ 2 . 1000 - 1989 ] . 13 + 169

=> [2000 -1989 ]. 13 + \(13^2\)

=> 11.13 + 13.13

=>13.(11 + 13)

=> 13. 24 = 312