\(a.3\times2^3+3\times4^2\)
\(=3\times2^3+3\times\left(2^2\right)^2\)
\(=3\times2^3+3\times2^4\)
\(=3\times\left(2^3+2^4\right)=3\times\left(8+16\right)=3\times24=72\)
a)3 . 23 + 3 . 42
=3. ( 23 + 42 )
=3. ( 8 + 16 )
=3. 24
=72
Phần b) đang giải nhé
b)520:{[(16.5+2 2.5):5-5]+115}+20170
=520:<{[(16+22).5]:5-5}+115>+1
=520:<{[(16+4).5]:5-5}+115>+1
=520:<{[(20.5):5-5]}+115>+1
=520:{[(100:5-5)]+115}+1
=520:(15+115)+1
=520 :130 +1
=4 + 1
=5
CBHT
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