Question

tìm x

x + 9 = 20 - ( 12 - 75 ) - ( - 8 )

Answer 1

x + 9 = 20 - ( 12 - 75 ) - ( - 8 )

x+9=20-12+75+8=91

x=91-9=82

Answer 2

x+9=20-(12-75)-(-8)

x+9=20-[12+(-75)]-(-8)

x+9=20-[-(75-12)]-(-8)

x+9=20-(-63)-(-8)

x+9=(20+63)-(-8)

x+9=83-(-8)

x+9=83+8

x+9=91

x.   =91-9

x.   =82

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