Giải thích các bước giải :
`a)3.5^2-15.2^2-26:2`
`=3.25-15.4-26:2`
`=75-60-13`
`=2`
`b)84:4+3^9:3^7+5^0`
`=21+3^2+1`
`=21+9+1`
`=31`
`c)29-[16+3(51-49)]`
`=29-(16+3.2)`
`=29-(16+6)`
`=29-22`
`=7`
`d)1-[30-(5-1)^2]`
`=1-(30-4^2)`
`=1-(30-16)`
`=1-(-14)`
`=15`
`e)(-297)+630+297+(-330)`
`=-297+297+630-330`
`=0+300`
`=300`
`f)90-(2^2.25-3^2.7)`
`=90-(4.25-9.7)`
`=90-(100-63)`
`=90-37`
`=53`
`g)[(25-2^2.3)+(3^2.4+16)]:5`
`=[(25-4.3)+(9.4+16)]:5`
`=[(25-12)+(36+16)]:5`
`=(13+52):5`
`=65:5`
`=13`
`h)13+|-39|+(-2)`
`=13+39-2`
`=50`
`i)25-18+(-43)`
`=25-18-43`
`=-36`
`j)(-34)+11+|-34|+(-11)+105`
`=-34+11+34-11+105`
`=34-34+11-11+105`
`=0+0+105`
`=105`
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