1, Tính
a, 85:17+7.2-16:23+8
b, 17.46+39.51+22.46
2, Tìm x
a, 75-25:(x+3) = 2mũ 6 + 6
b, 5.7 mũ 2 -2 mũ x = 3.71
c,x mũ 3 -2. 5 mũ 2 = 166
( Giải giúp mình vs ạ)
1, Tính
a, 85:17+7.2-16:23+8
b, 17.46+39.51+22.46
2, Tìm x
a, 75-25:(x+3) = 2mũ 6 + 6
b, 5.7 mũ 2 -2 mũ x = 3.71
c,x mũ 3 -2. 5 mũ 2 = 166
( Giải giúp mình vs ạ)
`1.`
`a,85:17+7.2-16:23+8`
`=5+14-16/23+8`
`=19-16/23+8`
=18`7/23` + `8`
=10`7/23`
`b,17.46+39.51+22.46`
`=46.(17+39+22)`
`=46.78`
`=3588`
`2.`
`a, 75-25:(x+3) = 2^6 + 6`
`75-25:(x+3)=70`
`25:(x+3)=5`
`x+3=5`
`x=2`
Vậy `x=2`
`b, 5.7^ 2 -2^x = 3.71`
`245-2^x=213`
`2^x=32`
`2^x=2^5`
`=>x=5`
Vậy `x=5`
`c,x ^ 3 -2. 5 ^2 = 166`
`x^3-50=166`
`x^3=216`
`x^3=6^3`
`=>x=6`
Vậy `x=6`
xin hay nhất ạ