Thực hiện phép tính:
( - 80 ) : { 51 - [ 18 - ( 23.3 - 5 ) ] }
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a, 80 - 4 . 5 2 - 3 . 2 3
= 80 – (4.25 – 3.8)
= 80 – 76 = 4
b, 5 6 : 5 4 + 2 3 . 2 2 - 1 2018
= 5 2 + 2 5 - 1
= 25 + 32 – 1 = 56
c, [36.4 – 4. 82 - 7 . 11 2 ]:4 – 2019 0
= (144 – 4. 5 2 ):4 – 1
= (144 – 100):4 – 1
= 11 – 1 = 10
d, 303 – 3.{[655 – (18:2+1). 4 3 +5]}: 10 0
= 303 – 3.(655 – 10.64 + 5):1
= 303 – 10 = 293
18 : 3 + 182 + 3 ( 51 : 17 )
= 6 + 182 + 3 . 3
= 188 + 9
= 197
=))
\(18:3+182+3\left(51:17\right)\)
\(=6+182+3.3\)
\(=6+182+9\)
\(=197\)
Chúc bạn học tốt!
a) 80-(4.52-3.23)=80-100+24=4
b)[36.4-4.(82-7.11)2]:4-20190
={4.[36-(82-7.11)2]}:4-1
=[36-(82-7.11)2]-1
=11-1=10
c)56:54+23.22-12018
=52+25-1
=25+32-1=56
d)303-3.{[655-(18:2+1).43+55]}:100
=303-3.[(655-9-1).43+55]:1
=303-3[655-640+5]
=303-3(20)
=303-60=243
a) 128 + 43 + 72 + 57
= ( 128 + 72 ) + ( 43 + 57 )
= 200 + 100
= 300
b) 41 . 51 + 49 . 51
= 51 . ( 41 + 49 )
= 51 . 90
= 4590
=
\(a,\) \(128+43+72+57\)
\(=\left(128+72\right)+\left(43+57\right)\)
\(=200+100\)
\(=300\)
\(b,\) \(41.51+49.51=51.\left(41+49\right)=51.90=4590\)
\(c,\) \(4^7:4^5=4^{7-5}=4^2=16\)
\(d,\) \(2.\left(5.4^2-18\right)\)
\(=2.\left(5.2^4-2.3^2\right)\)
\(=2.2.\left(5.2^3-3^2\right)\)
\(=4.\left(40-9\right)\)
\(=4.31=123\)
= -20/13 nha bạn
\(=\left(-80\right):\left\{51-\left[18-\left(24-5\right)\right]\right\}\)\(=\left(-80\right):\left\{51-\left[18-\left(24-5\right)\right]\right\}\)
\(=\left(-80\right):\left\{51-\left[18-19\right]\right\}\)
\(=\left(-80\right):\left\{51-\left(-1\right)\right\}\)
\(=\left(-80\right):52\)
\(=\frac{80}{52}\)
\(=\frac{20}{13}\)
\(----Have.A.Nice.Day.!!!----\)