`-`Đáp án`+`Giải thích các bước giải:
` B1: `
` a) (-37)+14+26+37 `
`= [(-37+37] + (14+26)`
`= 0 + 40 = 40`
` b) (38-29+43) -(43+38)`
`= 38 - 29 + 43 - 43 - 38`
`= (38-38)+(43-43)-29`
`= 0+0-29 = -29`
` c)17.102 - 17.202`
`= 17.(102-202)`
`= 17.(-100)`
`= -1700`
` d) 35.18 - 5.7.28`
`= 35.18 -35.28`
`= 35.(18-28)`
`= 35.(-10) =-350`
` B2:`
` a) 2.|x+4|=10`
`-> |x+4| = 10:2=5`
`->` \(\left[ \begin{array}{l}x+4=5\\x+4=-5\end{array} \right.\)
`->` \(\left[ \begin{array}{l}x=5-4=1\\x=-5-4=-9\end{array} \right.\)
Vậy `x∈{1;-9}`
` b)5x + 64^0 = 21`
`-> 5x + 1 = 21`
`-> 5x = 21-1=20`
`-> x = 20:5=4`
Vậy `x=4`
` c) (12x-4^3) .8^3 = 4.8^4`
`-> 12x - 4^3 = 4 . 8^4 : 8^3 = 4.8^(4-3) =4.8`
`-> 12x -64 = 32`
`-> 12x = 32+64=96`
`-> x = 96:12 = 8`
Vậy `x=8`
