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Bài làm
( 10 + 20 + 30 + ..... + 900 ) x ( 60 x 1 - 60 )
= ( 10 + 20 + 30 + ...... + 900 ) x ( 60 - 60 )
= ( 10 + 20 + 30 + ...... + 900 ) x 0
= 0
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200 + 800 = 1000
900 + 100 - 20 =980
Ủng hộ nha! :)
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a ) x + 234 = 456 - 1
x + 234 = 455
x = 455 - 234
x = 221
b ) x + 20 = 100 - 20
x + 20 = 80
x = 80 - 20
x = 60
1) x + 234 = 456 - 1
x + 234 = 455
x = 455 - 234
x = 221
2) x + 20 = 100 - 20
x + 20 = 80
x = 80 - 20
x = 60
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X+(100-90)=20
X+10=20
X = 20-10
X = 10
nha
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x - 100 = 900
x = 900 + 100
x = 1 000.
x + 200 = 500
x = 500 - 200
x = 300.
x - 100 = 900
x = 900 + 100
x = 1000
x + 200 = 500
x = 500 - 200
x= 300
k
100x20+20x900
=(100+900)x20
=1000x20
=20000
=20000
ung ho minh nha
chiến binh ngân nga!!!