1 . a) 36.23 + 62.23 + 46 = 36.23 + 62.23 + 46.2
= 23 . ( 36 + 62 + 2 )
= 23 . 100
= 2300
2 : TÌm x :
a . 47 . x + 213 = 3.7.3.7
47. x + 213 = 441
47 . x = 441 - 213
47 . x = 228
x = 228 : 47
x = 4,85
b ) 83 + 519 . x = 66.100 + 22
83 + 519 . x = 6600 + 22
83 + 519 . x = 6622
519 . x = 6622 - 83
519 . x = 6539
x = 6539 : 519
x = 12,599
Bài 1:
a. 36.23+62.23+46
= (36+62).23+46
= 98.23 +46
= 2254 + 46
= 2300
Bài 2:
a. 47. x + 213 = 3.7.3.7
47. x + 213 = 441
47. x = 441 - 213
47 . x = 228
x = 228 : 47
Vậy: x = \(\frac{228}{47}\)
b. 83 + 519.x = 66.100 + 22
83 + 519.x = 6600 + 22
83 + 519.x = 6622
519.x = 6622 - 83
519.x = 6539
x = 6539 : 519
Vậy: x = \(\frac{6539}{519}\)