Tính:
a, 100/2+56
b, 100+60/3
c, 100*5-56
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a) = 8 . 15 - [115- 72 ]
= 8 . 15 - [115- 49 ]
= 120 - 56
= 64
b) = 100 : {250 : [450 - (2.125 - 8.25)]}
= 100 : {250 : [450 - (250 - 200 )]}
= 100 : {250 : [450 - 50]}
= 100 : {250 :400}
= 100 : 0,265
= 0,00265
=
\(a,2^3.15-\left[115-\left(12-5\right)^2\right]\)
\(=8.15-\left[115-\left(12-5\right)^2\right]\)
\(=120-\left[115-7^2\right]\)
\(=120-\left[115-49\right]\)
\(=120-66\)
\(=54\)
\(b,100:\left\{250:\left[450-\left(2.5^3-2^3.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(2.125-8.25\right)\right]\right\}\)
\(=100:\left\{250:\left[450-\left(250-200\right)\right]\right\}\)
\(=100:\left\{250:\left[450-50\right]\right\}\)
\(=100:\left\{250:400\right\}\)
\(=100:0,625\)
\(=160\)
\(2^3.15-\left[115-\left(12-5\right)^2\right]=8.15-\left[115-7^2\right]=120-\left[115-49\right]=120-66=54\)
\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.125-4.25\right)\right]\right\}=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)
\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
1a) Tính nhẩm:
a)2,35 x 10 = 23,5 17,5 x 10 = 175
b)6,19 x 100 = 619
0,8 x 100 = 80
c)4,529 x 1000 = 4529
0,3 x 1000 = 300
Bài 2: Đặt tính rồi tính:
a) 7,56 x 60 = 453,6
b) 12,6 x 800 = 10080
a) 85793 - 36841 + 3826 = 48952 + 3826 = 52778
b) \(\dfrac{84}{100}-\dfrac{29}{100}+\dfrac{30}{100}\) = \(\dfrac{55}{100}+\dfrac{30}{100}\) = \(\dfrac{85}{100}\) =\(\dfrac{17}{20}\)
c) 325,97 + 86,54 + 103,46 = 412,51 + 103,46 = 515,97
\(\text{A = 1-2-3-4+5-6-7-8+9-10-11-12+...........+97-98-99-100}\)
\(\text{A =(1-2-3-4)+(5-6-7-8)+(9-10-11-12)+.............+(97-98-99-100)}\)
\(\text{A =-8+(-16)+(-24)+..................+(-200)}\)
\(\text{A =-8.(1+2+3+......+25)}\)
\(\text{A =-8.[(25-1):1+1.26:2]}\)
\(\text{A =-8.325}\)
\(\text{A =-2600 Vậy A = -2600 }\)
=1+(2-3-4+5)+(6-7-8+9)+...+(98-99-100+101)+102
=1+0+0+0+....+102
=103
k mk nha
a) \(\frac{4}{5}\) của 100 là: \(\frac{4}{5}.100=80\)
b) \(\frac{1}{4}\) của -8 là: \(\frac{1}{4}.(-8)=-2\)
a, 100/2+56
=50+56
=106
b, 100+60/3
=100+20
=120
c, 100*5-56
=500-56
=444