Question

[Tống Thùy Linh]

a	b	a-b
2	7
35	-21
-56	-44
-23	7
x-12	32+x

Tính nhanh:

2014+(2016-2030)

(26-512)-(226-712).

Mik đag gấp giải giúp mik nha,cảm ơn trước nhé!!!

Answer 1

[wattif]

a	b	a-b
2	7	-5
35	-21	56
-56	-44	-12
-23	7	-30
x-12	32+x	-44

2014+(2016-2030)

= 2014+2016-2030

=4030-2030

=2000

(26-512)-(226-712)

=26-512-226+712

=(26-226)-(512-712)

=-200+200

=0

Answer 2

[Agatsuma Zenitsu]

a	b	a - b
2	7	2 - 7 = -5
35	-21	35 - - 21 = 35 + 21 = 56
-56	-44	-56 - - 44 = -56 + 44 = -12
-23	7	- 23 - 7 = -30
x - 12	32 + x	(x - 12) - (32 + x) = x - 12 - 32 -x = -12 -32 = -44

\(2014+\left(2016-2030\right)=2014+2016-2030=\left(2014+2016\right)-2030=4030-2030=2000\)

\(\left(26-512\right)-\left(226-712\right)=26-512-226+712=\left(26-226\right)+\left(-512+712\right)=-200++200=0\)