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Trả lời :
a) 43 . 101 - 64
= 64 . 101 - 64
= 64 . ( 101 - 1 )
= 64 . 100 = 6400
b) \(\frac{5^8}{5^5}+3^2.3^3-\left(30-19\right)^2\)
= 53 + 35 - 112
= 125 + 243 - 121
= 247
a) 43 .101 - 64 =
= 43 . 101 - 43
= 43 .( 101 - 1 )
= 43 .100
= 6400
-(127+38-21)-(121-27+48)+50
=-127-38+21-121+27-48+50
=(-127+27)-(38+48)+(21-121)+50
=-100-86-100+50
=-(100+100+86)+50
=-286+50
=-236
-39+(193-127+96)-(193+196-127)
=-39+193-127+96-193-196+127
=-39+(193-193)-(127+127)+(96-196)
=-39-100
=-139
(23.94+93.45):(92.10-92)
= ( 8. 94+93.9.5):(81.10-81)
= (8.94+94.5):(810-81)
=[94.(8+5)]:729
=[94.13]:729
=6561.13:729
=6561:729.13
=9.13
=117
Mk nhanh nhat day
(23.94+93.45):(92.10-92)
=(23.94+5.94):(81.10-81)
=[94.(8+5)]:(810-81)
=(6561.13):729
=85296:729
=117
\(b,2^3x5^3-3x\left\{400-\left[673-2^3x\left(7^8:7^6+7^0\right)\right]\right\}\)
\(=1000-3x\left\{400-\left[673-8x\left(7^2+1\right)\right]\right\}\)
\(=1000-3x\left\{400-\left[673-8x50\right]\right\}\)
\(=1000-3x\left\{400-\left[673-400\right]\right\}\)
\(=1000-3x\left\{400-273\right\}\)
\(=1000-3x127\)
\(=1000-381\)
\(=619\)
\(a,1968:16+5136:16-704:16\)
\(=\left(1968+5136-704\right):16\)
\(=6400:16\)
\(=400\)
\(\left[504-\left(5^2.8+70\right):3^3+6\right]:25\)
\(\left[504-\left(25.8+70\right):27+6\right]:25\)
\(\left[504-\left(200+70\right):27+6\right]:25\)
\(\left[504-270:27+6\right]:25\)
\(\left[504-10+6\right]:25\)
\(\left[494+6\right]:25\)
\(500:25\)
= 20
\(\left[504-(5^2\cdot8+70):3^3+6\right]:25\)
\(=\left[504-(25\cdot8+70):27+6\right]:25\)
\(=\left[504-(200+70):27+6\right]:25\)
\(=\left[504-270:27+6\right]:25\)
\(=\left[504-10+6\right]:25\)
\(=\left[494+6\right]:25\)
\(=500:25=20\)
\(\text{Ko chắc }:)\)
a, (-20) + 16 + (-34) + 20 = [(-20) + 20] + [16 + (-34)] = 0 + (-18) = (-18) b, 12 + 3.[39 - (5 - 2)2] = 12 + 3.[39 - 32] = 12 + 3.[39 - 9] = 12 + 3.30 = 12 + 90 = 102
=11+(-7).12+(-48):(-4)+25
=11+(-84)+12+25
=-73+12+25
= -61+25
=-36
11 + (- 7) . 12 + (- 48) : (- 4) + 52
= 11 + (- 84) + 12 + 25
= - 73 + 37
= - 36