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

`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`

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