a) 3,125 + 4,15 = 7,275

b) 5,2 x 2 = 10,4

a) 3,125 + 2,075 x 2 = 3,125 + 4,15 = 7,275 .

b) (3,125 + 2,075) x 2 = 5,2 x 2 = 10,4

50 chục

a) \(3.125+2.075\cdot2=3.125+4.15=7.275\)

(3,125 + 2,075) x 2 = 5,2 x 2 = 10,4.

3,125 + 2,075 x 2

= 3,125 + 4,15 = 7,275

Hoặc

3,125 + 2,075 x 2

= 3,125 + 2,075+ 2,075

=5,2 + 2,075

= 7,275 .

… = 5,2 x 2 = 10,4

… = 3,125 + 4,15

= 7,275 .

hoặc …= 3,125 + 2,075+ 2,075

=5,2 + 2,075

=7,275

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a) Cách 1:

\(\left(6,24+2,075\right):0,75\)

\(=8,315:0,75\)

\(=11,09\)

Cách 2:

\(\left(6,24+2,075\right):0,75\)

\(=6,24:0,75+2,075:0,75\)

\(=8,32+2,77\)

\(=11,09\)

b) Cách 1:

\(\left(3,125-2,075\right)\times2\)

\(=1,05\times2\)

\(=2,1\)

Cách 2:

\(\left(3,125-2,075\right)\times2\)

\(=3,125\times2-2,075\times2\)

\(=6,25-4,15\)

\(=2,1\)

a, C1 : (6,24 + 2,075) : 0,75

=8,315 : 0,75

\(\approx\)11,09

C2 : (6,24 + 2,075) : 0,75

=6,24 : 0,75 + 2,075 : 0,75

\(\approx\)8,32 + 2,77

\(\approx\)11,09

b,C1: (3,125 - 2,075)  *2

=1.05 * 2

=2,1

C2:(3,125 - 2,075)  *2

=3,125 * 2 - 2,075 * 2

=6.25 - 4.15

=2,1

_Hok tốt_

a 15/17  < 1

b 3/10  < 2/5

c 3,125  > 2,075

d 56,9 >56