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36 x 12 + 36 x 45 + 36 x 33
= 36 x (12 + 45 + 33)
= 36 x 90
= 3240
b) 78 x 31 + 78 x 24 + 78 x 17 + 22 x 72
=78 x (31 + 24 + 17) + 22 x 72
= 78 x 72 + 22 x 72
= (78 + 22) x 72
= 100 x 72
= 7200
c) ( 34 - 17 )2 - 23 x 32
\(=17^2-8.9\)
\(=289-72\)
\(=217\)
#)Giải :
a)\(9^2\div\left(27^3.81^2\right)=9^2\div\left[\left(3^3\right)^3.\left(9^2\right)^2\right]=9^2\div\left(3^9.9^4\right)\)
Tự lm típ
a,\(9^2:\left(27^3.81^2\right)=3^4:\left(3^9.3^8\right)=3^4:\left(3^{9+8}\right)=3^4:3^{17}=3^{-13}\)
\(a,5^2.36+25.4\)
\(=25.36+25.4\)
\(=25.\left(36+4\right)\)
\(=25.40\)
\(=1000\)
\(b,7^9.7^7:7^{15}-7^0\)
\(=7^{16}:7^{15}-1\)
\(=7-1\)
\(=6\)
a) 52.36 + 25 .4
= 25.36 + 25 .4
=25 . ( 36 + 4 )
=25 . 40
=25.4.10
=100.10
=1000
a,113-3+20
=1328+20
=1348
b,300+7781+1425
=9506
c,7+36-40
=43-40=3
a,
115 : 112 - 33 : ( 11 + 23 ) + 22 x 30 x 5
= 11( 5 - 2 ) - 27 : ( 1 + 8 ) + 4 x 1 x 5
= 113 - 27 : 9 + 4 x 5
= 1331 - 3 + 20
= 1328 + 20
= 1348
b,
12 x 25 + 31 x 251 + 57x 25
= 12 x 25 + 57 x 25 + 31 x 251
= ( 12 + 57 ) x 25 + 31 x 251
= 69 x 25 + 31 x 251
= 1725 + 7781
= 9506
c,
15 - 23 + 4 x 32 - 5 x 8
= 15 - 8 + 4 x 9 - 40
= 15 - 8 + 36 - 40
= 7 + 36 - 40
= 43 - 40
= 3
Thực hiện phép tính
1. [ 36 . 4 - 4 . ( 82 - 7 . 11 )2] : 4 - 20190
= [ 36 . 4 - 4 . 25 ] : 4 - 1
= [ 4.(36 - 25)] : 4 - 1
= 44 : 4 - 1
= 11 - 1
= 10
2. 500 - { 5 . [ 409 - ( 23. 3 - 21 )3] - 1724 }
\(\left\{\left[261-\left(36-31\right)^3.2\right]-9\right\}.1001.2016^0\)
\(=\left\{\left[261-5^3.2\right]-9\right\}.1001.2016^0\)
\(=\left\{\left[261-125.2\right]-9\right\}.1001.2016^0\)
\(=\left\{\left[261-250\right]-9\right\}.1001.2016^0\)
\(=\left\{11-9\right\}.1001.2016^0\)
\(=2.1001.2016^0\)
\(=2002.2016^0\)
\(=2002.1\)
\(=2002\)
\(\left\{\left[261-\left(36-31\right)^3.2\right]-9\right\}.1001.2016^0\)
\(=\left\{\left[261-5^3.2\right]-9\right\}.1001\)
\(=\left[\left(136.2\right)-9\right].1001\)
\(=\left(272-9\right).1001\)
\(=263.1001\)
\(=263263\)