y:8+yx8-56,78=69,11x2

y:8+yx8-56,78=138,22

y:8+yx8=138,22+56,78

y:8+yx8=195

chịu

CHÚC BẠN HỌC GIỎI

TK MÌNH NHÉ

y : 8 + y x 8 - 56.78 = 69.11 x 2

y : 8 + y x 8 - 56.78 = 138.22

y : 8 + y x 8 = 138.22 + 56.78

y : 8 + y x 8 = 195

y x 0.125 + y x 8 = 195

y x ( 0.125 + 8 ) = 195

y x 8.125 = 195

y            = 195 : 8.125

y            = 24

a) \(45,23+56,78-12\cdot10\)

a = 89,91

b =24,78913

c = không biết và minh nha kết bạn nữa

50

5.5+5.5=25+25=50

ok 50

= 625

5.5:5.5=25:25=1

1

a, \(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6-1,3=4,7\)

b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)

\(=0+0=0\)

Chúc bạn học tốt!!!

a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7

b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0

a)\(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6+\left(-1,3\right)=4,7\)

b)\(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(-5,5+5,5\right)\)

\(=0+0=0\)

Nhầm nhé 19

chúc học tốt

19.5:5.5:5.5:5= 19

= 0.1289256198347107.

a;Zn + 2HCl\(\rightarrow\)ZnCl₂+H₂

Zn+ H₂SO₄\(\rightarrow\)ZnSO₄+H₂

b;TN1:

\(\sum n_{H_2}=0,1+0,1=0,2\left(mol\right)\)

V_H2=22,4.0,2=4,48(lít)

TN2:

\(\sum n_{H_2}=0,1+0,05=0,15\left(mol\right)\)

V_H2=22,4.0,15=3,36(lít)

Vậy ở TN1 sinh ra nhiều H2 hơn

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a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

=  4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.