Question

Thực hiện phép tính (Hợp lí nếu có thể):

a) 45.37 + 45.63 - 100

b) 148.9 - 3².48

c) 307 - [(180.4⁰ - 160) : 2² + 9] : 2

d) 12 + 3.{90 : [39 - (2³ - 5)²]}

Answer 1

a) 45.37 + 45.63 - 100

\( 45.(37 + 63) – 100 \)

\(45.100 – 100\)

 \(100.(45 – 1) \)

\( 100 . 44 = 4400\)

Answer 2

a,-9

b,116.42

c,300

d,21

Answer 3

a)\(=45.\left(37+63-\dfrac{20}{9}\right)=45\cdot\dfrac{880}{9}=4400\)

b)\(=148.9-9.48=9.\left(148-48\right)=9.100=900\)

 

Answer 4

\(148.9 - 3^2.48\)

\(= 148.9 – 9.48 \)

\(= 9.(148 – 48)\)

\(= 9.100 = 900\)

Answer 5

\(307 - [(180.4^0 - 160) : 2^2 + 9] : 2 \)

= \(307 – [(180.1 – 160):4 + 9]:2\)

=\(307 – [20:4 + 9]:2 \)

= \(307 – [5 + 9]:2\)

= \(307 – 14:2\)

=\( 307 – 7 = 300\)

Answer 6

Lời giải:

a. $=45(37+63)-100=45.100-100=100(45-1)=100.44=4400$

b. $=148.9-9.48=9(148-48)=9.100=900$

c. $=307-[(180-160):4+9]:2=307-(20:4+9):2=307-14:2=307-7=300$

d. \(=12+3.90:[39-(8-5)^2]=12+3.90:(39-9)=12+3.90:30=12+3.3=12+9=21\)