Вычисли: внизы писать действия. 1280-850:5·4 960:3+2800:400 4089+2005-47·2 270·3+210:42 425:25·900-998 4870-2593+25·10 6·3209:3 8·2023:4 5·23417-10305:5 4·12310:2-5890

a) 1280 - 850 : 5 * 4 = 1280 - 170 * 4 = 1280 - 680 = 600;

1) 850 : 5 = 170,

2) 170 * 4 = 680,

3) 1280 - 680 = 600.

b) 960 : 3 + 2800 : 400 = 320 + 7 = 327;

1) 960 : 3 = 320,

2) 2800 : 400 = 7,

3) 320 + 7 = 327.

c) 4089 + 2005 - 47 * 2 = 6094 - 94 = 6000;

1) 47 * 2 = 94,

2) 2005 - 94 = 1911,

3) 4089 + 1911 = 6000.

d) 270 * 3 + 210 : 42 = 810 + 5 = 815

1) 210 : 42 = 5,

2) 270 * 3 = 810,

3) 810 + 5 = 815.

e) 425 : 25 * 900 - 998 = 17 * 900 - 998 = 15300 - 998 = 14302;

1) 425 : 25 = 17,

2) 17 * 900 = 15300,

3) 15300 - 998 = 14302.

f) 4870 - 2593 + 25 * 10 = 2277 + 250 = 2527;

1) 25 * 10 = 250,

2) 4870 - 2593 = 2277,

3) 2277 + 250 = 2527.

g) 6 * 3209 : 3 = 19254 : 3 = 6418;

1) 6 : 3 = 2,

2) 2 * 3209 = 6418.

h) 8 * 2023 : 4 = 2 * 2023 = 4046

1) 8 : 4 = 2

2) 2 * 2023 = 4046.

i) 5 * 23417 - 10305 : 5 = 117085 - 2061 = 115024;

1) 10305 : 5 = 2061,

2) 5 * 23417 = 117085,

3) 117085 - 2061 = 115024.

j) 4 * 12310 : 2 - 5890 = 2 * 12310 - 5890 = 24620 - 5890 = 18730;

1) 4 : 2 = 2,

2) 2 * 12310 = 24620,

3) 24620 - 5890 = 18730.