a,45+(20-65)
b,37.24 +76.37
c,420{30:[260-(91.5-23.52)]}
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1, 15+(20-35)
=15+(-15)
=0
2,37.24+76.37
=37(24+76)
=37.100
=3700
3,420:{30:[260-(91.5-\(2^3\).\(5^2\))]}
=420:{30:[260-(455-200)
=420:[30:(260-455+200)
=420:(30:5)
=420:6
=70
5,2(x-11):3=56
<=>2(x-11)=56.3
<=>2(x-11)=168
<=>x-11=168:2
<=>x-11=84
<=>x=84+11
<=>x=95
Vậy x=95
a, 600 : { 450 : 450 - 4 . 5 3 - 2 3 . 5 2 }
= 600:{450:[450 - (4.125 - 8.25)]} = 600:{450:[450 - (500 - 200)]}
= 600:{450:[450 - 300]} = 600:{450:150} = 600:3 = 200
b, 18 . { 420 : 6 - 150 - ( 68 . 2 - 2 3 . 5 ) }
= 18.{70 - [150 - (68.2 - 8.5)]} = 18.{70 - [150 - (136 - 40)]}
= 18.{70 - [150 - 96]} = 18.{70 - 54} = 18.16 = 288
a
=[135+65]+[260+40]
=200+200=400
b
=[463+127]+[218+22]
=500+240=740
c
=[20+30]+[21+29]+[22+28]+[23+27]+[24+26]+25
=50+50+50+50+50+25=275
h minh nha ban
a: 785+135-85+65
=785-85+135+65
=700+200
=900
b: \(32\cdot39+52\cdot21-12\cdot39+21\cdot48\)
\(=39\cdot32-12\cdot39+52\cdot21+21\cdot48\)
\(=39\left(32-12\right)+21\left(52+48\right)\)
\(=39\cdot20+21\cdot100=2100+780=2880\)
c: \(5^4\cdot5^8:5^9\cdot6\cdot8\cdot7\)
\(=\dfrac{5^{12}}{5^9}\cdot48\cdot7\)
\(=125\cdot48\cdot7=42000\)
d: \(2021^0-\left\{15^2:\left[175+\left(2^3\cdot5^2-6\cdot25\right)\right]\right\}\)
\(=1-\dfrac{225}{175+8\cdot25-150}\)
\(=1-\dfrac{225}{25+220}\)
=1-1
=0
a) 785 + 135 - 85 + 65 = 900
b) 32.39 + 52.21 - 12.39 + 21.48 = 93.69
c) 5 mũ 4.5 mũ 8 ÷ 5 mũ 9.6 ÷ 8.7 = 0.134
d) 2021 mũ 0 - { 15 mũ 2 : [ 175 + ( 2 mũ 3.5 mũ 2 - 6.25 ) ] } = 2021 mũ 0 - { 152 : [ 175 + 17.27 ] } = 20210 - { 152 : 192.27 } = 20210 - 0.791 = 20209.209
a, x + 350 : x = 93 - 45 : 2
=> x + 350 : x = 93 - 22,5
=> x + 350 : x = 70,5
=> ?
1)
a) -(2+5) = -2 - 5 = -7
b) +(-3+6) = -3 + 6 = 3
c) (-50+3) = -50 + 3 = -47
d) -(-2+3) = 2 - 3 = -1
e) -(10-3) = -10 + 3 = -7
f) -(-3)-(-3+1) = 3 + 3 - 1 = 5
g) (-5)+(-2+10) = -5 - 2 + 10 = 3
2)
a) -50+120+(-150)-20+30
= -(50 + 20) + (120 + 30 - 150)
= -70
b) 265-70+(-65)-30+15
= (265 - 65) - (70 + 30) + 15
= 200 - 100 + 15 = 115
c) -17+185-183+(-85)-63
= (185 - 85) - (183 + 17) - 63
= 100 - 200 - 63 = -163
d) -30+60+(-170)-260+19
= -(170 + 30) - (260 - 60) + 19
= -200 - 200 + 19 = -381
Ư(20)={1;2;4;5;10;20}
Ư(30)={1;2;3;5;610;15;30}
B(12)={0;12;24;36;...}
B(8)={0;8;16;24;...}
Ư(45)={1;3;5;9;15;45}
Ư(65)={1;3;5;15}
B(7)={0;7;14;21;...}
B(5)={0;5;10;15;...}
\(Ư\left(20\right)=\left\{\pm1;\pm2;\pm4;\pm5;\pm10;\pm20\right\}\)
\(Ư\left(30\right)=\left\{\pm1;\pm2;\pm3;\pm5;\pm6;\pm10;\pm15;\pm30\right\}\)
\(Ư\left(12\right)=\left\{\pm1;\pm2;\pm3;\pm4;\pm6;\pm12\right\}\)
\(B\left(8\right)=\left\{0;\pm8;\pm16;\pm24;\pm32;\pm40;...\right\}\)
\(Ư\left(45\right)=\left\{\pm1;\pm3;\pm5;\pm9;\pm15;\pm45\right\}\)
\(B\left(7\right)=\left\{0;\pm7;\pm14;\pm21;\pm28;...\right\}\)
\(B\left(5\right)=\left\{0;\pm5;\pm10;\pm15;\pm20;....\right\}\)
a. 420+65×4=(x+175):5+30
(x+175):5+30=420+260
(x+175):5+30=680
(x+175):5=650
x+175=3250
x=3075
b.(32×15):2=(x+70):14-40
(x+70):14-40=480:2
(x+70):14-40=240
(x+70):14=280
x+70=3920
x=3850
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mik khỏi chép lại đề nha
a) 680 = (x + 175) : 5 + 30
(x + 175) : 5 = 680 - 30
(x + 175) : 5 = 650
x + 175 = 650 x 5
x + 175 = 3250
x = 3250 - 175
x = 3075
b) 240 = (x + 70) : 14 - 40
(x + 70) : 14 = 240 + 40
(x + 70) : 14 = 280
x + 70 = 280 x 14
x + 70 = 3920
x = 3920 - 70
x = 3850
tk mik nha b
x + 175 = 130
x =
a,45+(20-65)
=45-45
=0
b,37.24 +76.37
=37.(24+76)
=37x100
=3700
37 x 24 +76 x 37
= 37 x ( 24+76 )
= 37 x 100
= 3700