a) \(17-229+17-25+299=79\)
b) \(125-679+145-125+679=145\)
a, 17-229+17-25+229 b. 125 - 679 + 145 - 125 + 679
= ( 17-17) + ( 229 - 229)+25 = ( 125 - 125) + ( 679 - 679) + 145
= 0+0+25
= 25
\(a,\left(17-229\right)+\left(17-25+229\right)\)
\(=17-229+17-25+229\)
\(=\left(17+17-25\right)+\left(-229+229\right)\)
\(=\left(34-25\right)+0\)
\(=9\)
\(b,\left(125-679+145\right)-\left(125-679\right)\)
\(=125-679+145-125+679\)
\(=\left(125-125\right)+\left(-679+679\right)+145\)
\(=0-0+145=145\)
Nhớ k nha mỏi tay rùi
Tớ trả lời đầy đủ nhất.
a, ( 17 - 229 ) + ( 17 - 25 + 229 )
= 17 - 229 + 17 - 25 + 229
= 17 - 17 - 229 + 229 - 25
= 0 + 0 - 25
= -25
b, (125 - 679 + 145 ) - ( 125 - 679 )
= 125 - 679 + 145 - 125 + 679
= 125 - 125 - 679 + 679 + 145
= 0 + 0 + 145
= 145
#Chúc bạn học tốt
= 17 + 17 - 229 + 229 - 25 = 34 - 25 = 9
a, (17 - 229) + (17 - 25 + 229)
= 17 - 229 + 17 - 25 +229
= 17 + (- 229 + 229) + 17 - 25
= 17 +17 - 25
= 9
b,(125 - 679 + 145) - (125 - 679)
= 125 - 679 + 145 - 125 + 679
= [125 + (- 125)] + (- 679 +679) + 145
=145
Ta có:
\(a)\left(17-229\right)+\left(17-25+229\right)\)
\(=17-229+17-25+229\)
\(=\left(17+17\right)+\left(-229+229\right)-25\)
\(=17+17+0+\left(-17-8\right)\)
\(=17+17-17-8\)
\(=17-8+\left(17-17\right)\)
\(=9+0=9\)
\(b)\left(125-679+145\right)-\left(125-679\right)\)
\(=125-679+145-125+679\)
\(=\left(125-125\right)+\left(-679+679\right)+145\)
\(=0+0+145=145\)
#Mạt Mạt#
