Bài 6:
a: \(1024:2^5+140:\left(38+2^5\right)-7^{23}:7^{21}\)
\(=\frac{1024}{32}+140:\left(38+32\right)-7^2\)
=32+140:70-49
=32+2-49
=34-49
=-15
b; \(36\cdot55-185\cdot11+121\cdot5\)
\(=36\cdot55-5\cdot37\cdot11+5\cdot11\cdot11\)
\(=55\left(36-37+11\right)=55\cdot10=550\)
c: \(98\cdot42-50\cdot\left\lbrack\left(18-2^3\right):2+3^2\right\rbrack\)
\(=98\cdot42-50\cdot\left\lbrack\left(18-8\right):2+9\right\rbrack\)
\(=98\cdot42-50\cdot\left\lbrack\frac{10}{2}+9\right\rbrack=98\cdot42-50\cdot14\)
=4116-700
=3416
d: \(407-\frac{\left\lbrack\left(190-170\right):4+9\right\rbrack}{2}\)
\(=407-\frac{20:4+9}{2}=407-\frac{5+9}{2}\)
=407-7
=400
e: \(\left(23\cdot36-17\cdot36\right):36\)
\(=\frac{36\left(23-17\right)}{36}\)
=23-17
=6
f: \(3\cdot2^5-27:3^2+5^2\cdot4-18:3^2\)
\(=3\cdot32-27:9+25\cdot4-18:9\)
=96-3+100-2
=93+100-2
=191
