Question

Hải nhanh giúp mik bài 4 nha

Answer 1

\(a,3.5^2+15.2^2-26\div2\)

\(\Rightarrow3.25+15.4-26\div2\)

\(\Rightarrow75+60-13\)

\(\Rightarrow122\)

Answer 2

a/ \(=3.25+15.4-13=75+60-13=122\)

\(b.=125.2-25+8.5=250-25+40=265\)

\(c.=36:9+100-27.3=4+100-81=23\)

\(d.=\left(4^3.4^2.1+4^5.8\right):4^5=\left(4^5.1+4^5.8\right):4^5\\ =\left[4^5.\left(1+8\right)\right]:4^5=4^5.9:4^5=4^5:4^5.9\\ =4^{5-5}.9=4^0.9=1.9=9\)

\(e.=\left[3^4.\left(15-12\right)\right]:3^5=\left(3^4.3\right):3^5\\ =3^5:3^5=3^0=1\)

\(f.\left[2^{19}.\left(16+34\right)\right]:2^{20}=\left(2^{19}.50\right):2^{20}=\left(2^{19}.2.25\right):2^{20}\\ =2^{20}.25:2^{20}=2^{20}:2^{20}.25=1.25=25\)

 

 

 

Answer 3

B4:

câu a:

\(=3.25+15.4-13=75-20-12=55-12=43\)

câu b:

\(=125-25+8.5=100+40=140\)

câu c:

\(=36:9+100-27.3=4+100-81=104-81=23\)