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x + 100 = 200 - 300
x + 100 = -100
x = ( -100 ) - 100
x = -200.
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100+50:2+75+200:2+400:2+500
= 100 + 25 + 75 + 100 + 200 + 500
= 100 + 100 + 100 + 200 + 500
= 500 + 500
= 1000
100 + 50 : 2 + 75 + 200 : 2 + 400 : 2 + 500
= 100 + 25 + 75 + 100 + 200 + 500
= 125 + 75 + 100 + 200 + 500
= 200 + 100 + 200 + 500
= 300 + 200 + 500
= 500 + 500
= 1000
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\(=\left(100+900\right)+\left(800+200\right)+...+\left(900+100\right)\)(9 cặp)
\(=1000+1000+...+1000\)(9 số 1000)
\(=1000\times9\)
\(=9000\)
k mình nha
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a) x= -300 -100
x = -400
b) x= -300 +100
x= -200
1)x+100=200-500
x+100=-300
x=-300-100
x=-400
2)x-100=200-500
x-100=-300
x=-300+100
x=-200