Tính nhanh:
A= 852+170 x 15 + 225
Ai nhanh mình k cho
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a, = (-8014) -273 +8104
= (-8014) +8104 -273
=-273
b, =45-712 -888+55
=45+55 -712-888
=100-1600
= -1500
Chúc bạn thi tốt nha!
Bài 3:
a: Ta có: \(23\left(42-x\right)=23\)
\(\Leftrightarrow42-x=1\)
hay x=41
b: Ta có: 15(x-3)=30
nên x-3=2
hay x=5
Bài 1:
a: 32+89+68=100+89=189
b: 64+112+236=300+112=412
c: \(1350+360+650+40=2000+400=2400\)
B , =(5327-247)-(1247-327)
= 5080 - 920
= kết quả tự đi mà tính
15 x 25 x 7 x 4 + 170 x 160
= (25 x 4) x (15 x 7) + 170 x 160
= 100 x 105 + 27200
= 10500 + 27200
= 37700
15 x 25 x 7 x 4 + 170 x 160
= ( 25 x 4 ) x ( 15 x 7 ) + 27200
= 100 x 105 + 27200
= 10500 + 27200
= 37700
Tk nha!!
a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)
a: =4(3h15'+2h4')=4(195'+124')=1276'
b: =3(15'45s-6'45s)=3x9'=27'
a) \(\dfrac{-5}{9}-\dfrac{4}{15}+\dfrac{2}{9}-\dfrac{11}{15}\)
\(=\left(\dfrac{-5}{9}+\dfrac{2}{9}\right)-\left(\dfrac{4}{15}+\dfrac{11}{15}\right)\)
\(=\dfrac{-3}{9}-\dfrac{15}{15}\)
\(=-\dfrac{1}{3}-1\)
\(=-\dfrac{4}{3}\)
b) \(\dfrac{-8}{13}-\dfrac{7}{16}+\dfrac{21}{13}-\dfrac{1}{6}\)
\(=\left(\dfrac{-8}{13}+\dfrac{21}{13}\right)-\dfrac{7}{16}-\dfrac{1}{6}\)
\(=\dfrac{13}{13}-\dfrac{29}{48}\)
\(=1-\dfrac{29}{48}\)
\(=\dfrac{19}{48}\)
c) \(\dfrac{-15}{25}-\dfrac{14}{21}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\dfrac{-3}{5}-\dfrac{2}{3}+\dfrac{8}{5}-\dfrac{5}{3}\)
\(=\left(\dfrac{-3}{5}+\dfrac{8}{5}\right)-\left(\dfrac{2}{3}+\dfrac{5}{3}\right)\)
\(=\dfrac{5}{5}-\dfrac{7}{3}\)
\(=1-\dfrac{7}{3}\)
\(=-\dfrac{4}{3}\)
a: =-5/9+2/9-11/15-4/15
=-3/9-1
=-12/9=-4/3
b: =-8/13+21/13-7/16-1/6
=1-1/6-7/16
=5/6-7/16
=19/48
c: =-15/25+8/5-2/3-5/3
=-7/3+1
=-4/3
A = 85^2 + 170.15 + 225;
=85^2+2.85.15+15^2
=(85+15)^2
=100^2
=10000
A= 852+170 x 15 + 225
A=7225+225+2550
A=7450+2550
A=10000