Question

 Thực hiện phép tính

a) 22.85 + 15.22 - 20200

b) 50 + [65 - (9 - 4)2]

c) (39 - 19) : (-2) + (34 - 22).5

d) 123.456 + 456.321 – 256.444

Answer 1

a) 22.85 + 15.22 - 20200

= 4.85 + 15.4 – 1

= 4.(85 + 15) – 1

= 4.100 – 1

= 400 – 1

= 399

b) 50 + [65 - (9 - 4)2]

= 50 +

= 50 + [65 – 25]

= 50 + 40

= 90

c) (39 - 19) : (-2) + (34 - 22).5

= 20 : (-2) + 12.5

= -10 + 60

= 50

d) 123.456 + 456.321 – 256.444

= 456.(123 + 321) – 256.444

= 456.444 – 256.444

= 444.(456 – 256)

= 444

Answer 2

a) 22.85 + 15.22 - 20200= 4.85 + 15.4 – 1= 4.(85 + 15) – 1= 4.100 – 1= 400 – 1= 399

b) 50 + [65 - (9 - 4)2]= 50 += 50 + [65 – 25]= 50 + 40= 90

c) (39 - 19) : (-2) + (34 - 22).5= 20 : (-2) + 12.5= -10 + 60

= 50d) 123.456 + 456.321 – 256.444= 456.(123 + 321) – 256.444=456.444 – 256.444= 444.(456 – 256)= 444