a) 

11 , 2 − 7 , 63 + 8 , 8 − 2 , 37 = 11 , 2 + 8 , 8 ⏟ − 7 , 63 + 2 , 37 ⏟                                                                       = 20 − 10                                                                       = 10

b)

3 , 45 × 123 + 4 × 3 , 45 − 3 , 45 × 27 = 3 , 45 × 123 + 4 − 3 , 45 × 27 = 3 , 45 × 127 − 3 , 45 × 27 = 3 , 45 × 127 − 27 = 3 , 45 × 100 = 345

a , 11 , 2 − 7 , 63 + 8 , 8 − 2 , 37 = 11 , 2 + 8 , 8 ⏟ − 7 , 63 + 2 , 37 ⏟ = 20 − 10 = 10 b , 3 , 45 × 123 + 4 × 3 , 45 − 3 , 45 × 27 = 3 , 45 × 123 + 4 − 3 , 45 × 27 = 3 , 45 × 127 − 3 , 45 × 27 = 3 , 45 × 127 − 27 = 3 , 45 × 100 = 345

3,45 x 99/100 + 3.45 x1/100

=3,45x(99/100+1/100)

=3,45x1

=3,45

3.45 x 99/100 + 3.45 + 1/100

3.45 x ( 99/100 + 1/100 )

3.45 x 1

3.45

đừng vu oan nhé

2,46+3,45+7,57

= ( 2,46+7,57)+3,45
=10+3,45

=13,45

Câu 1: 

= 3,45 x ( 123 + 4 - 27 )

= 345

Câu 2: 

3 x x = 3,45 : 5 

3 x x = 0,69

x= 0,69 : 3 = 0,23

Nhớ k cho mình

câu 2  (3*x)*5 = 3.45

3xx =3,45/5

3xx =0,69

3xx =0,69/3

x =0,23

đáp án là 0, 23

3,45 × 123 + 4 × 3,45 - 3,45 × 27

= 3,45 × (123+4-27)

= 3,45 × 100 = 345

\(\left(198,08\times23,56+165,9:27\right)\times\left(25,07\times3-75,21\right)+8,8\\ =\left(198,08\times23,56+165,9:27\right)\times\left(75,21-75,21\right)+8,8\\ =\left(198,08\times23,56+165,9:27\right)\times0+8,8\\ =0+8,8\\ =8,8\)

(198,08×23,56+ 165,9:27) × (25,07×3−75,21)+ 8,8

= (198,08 × 23,56 + 165,9 : 27) × (75,21 − 75,21) + 8,8

= (198,08× 23,56 +165,9:27) × 0 + 8,8

= 0+8,8

= 8,8

(198,08×23,56 + 165,9 : 27)×(25,07×3 − 75,21) + 8,8

= (198,08×23,56 + 165,9 : 27)×(75,21 − 75,21) + 8,8

= (198,08×23,56 + 165,9 : 27)×0 + 8,8

= 0 + 8,8

= 8,8

=(198,08*23,56+165,9:27)*0+8,8

=0+8,8

=8,8

9,45-2,37+1,37

=9,45-(2,31-1,37)

=9,45-1

=8,45

=10,45

9,45 - 2,37 + 1,37

= 9,45 - ( 2,37 - 1,37 )

= 9,45 - 1

= 8,45 

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