Toán Lớp 6: tìm x
1/ -16 + 23 + x = – 16
2/ 2x – 35 = 15
3/ 3x + 17 = 12
tính hợp lý
1/ 35. 18 – 5. 7. 28
2/ 45 – 5. (12 + 9)
3/ 24. (16 – 5) – 16. (24 – 5)
4/ 29. (19 – 13) – 19. (29 – 13)
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Toán Lớp 6: tìm x
1/ -16 + 23 + x = – 16
2/ 2x – 35 = 15
3/ 3x + 17 = 12
tính hợp lý
1/ 35. 18 – 5. 7. 28
2/ 45 – 5. (12 + 9)
3/ 24. (16 – 5) – 16. (24 – 5)
4/ 29. (19 – 13) – 19. (29 – 13)
Comments ( 2 )
1) x = -16 + 16 – 23 = -23
2) x = (15 + 35) : 2 = 25
3) x = (12 – 17) : 3 = -5/3
Tính hợp lý: (tính phép nhân trước, trừ sau)
1) = (35.18) – (5.7.28) = 630 – 980 = – 350
2) = 45 – 5. 21 = 45 – (5.21) = -60
3) = 24. 11 – 16. 19 = (24.11) – (16.19) = – 40
4) = 29. 6 – 19. 16 = (29.6) – (19.16) = – 130
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