1+2+34+5+6+78+9=?
1+6+7+9+3+5+67+78+23 +87+98+34+34=bao nhiêu
1+6+7+9+3+5+67+78+23 +87+98+34+34
= 7 + 7+ 9 + 3 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 14 + 9 + 3 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 23 + 3 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 26 + 5 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 31 + 67 + 78 + 23 + 87+ 98 + 34 + 34
= 98 + 78 + 23 + 87+ 98 + 34 + 34
= 176 + 23 + 87+ 98 + 34 + 34
= 199 + 87+ 98 + 34 + 34
= 286 + 98 + 34 + 34
= 452
mình tính bằng 452
bạn k mình nha
1+6+7+9+3+5+67+78+23+87+98+34+34=452
1+6+78+9=
2+44+5632=
2+34+45+5=
Trả lời :
1 + 6 + 78 + 9 = 94
2 + 44 + 5632 = 5678
2 + 34 + 45 + 5 = 86
Chúc bạn học giỏi!
1+2+3+4+5+6+7+8+9+10= 12+34+56+78+910= ai trả lời đúng được lì xì
1+2+3+4+5+6+7+8+9+10=55
12+34+56+78+910=1090
lì xì cho mình đi
1+2+3+4+5+6+7+8+9+10 = 55 12+34+56+78+910=1090
1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+10+5
=10+10+10+10+10+5
=55
12+34+56+78+910
=(12+78)+(34+56)+910
=90+90+910
=90+1000
=1090
1+2+3+4+5+6+7+8+9+0+1+2+3+4+5+6+7+8+9+9+8+7+6+5+4+3+2+1+1+34+4+6+7+8+97+6+4+3+32+4+57+7+8+8+6+65+4+3+3+46+7+8+7+64+3+3+5+68+8+6+3+3+5+78+8+6+54+5+7+8+852+3+5+89+8+5+45+7×9×9×9×9×9×9×9×9×9×9×9×8×8×7×9×9×7×7×87×7×8×7×7×8×7×7×8
34.{[(216+184):8]-42}
465+58+(-465)+(-78)
1+(-3)+5+(-7)+9+(-11)
1+2+3.......+100
80-[30-(5-1)2]
34.{[(216+184):8]-42}
=34.{[400:8]-42}
=34.{50-42}
=34.8
=272
465+58+(-465)+(-78)
=523+(-465)+(-78)
=58+(-78)
=-20
1+(-3)+5+(-7)+9+(-11)
=[1+(-3)]+[5+(-7)]+[9+(-11)]
=-2.3
=-6
1+2+3.......+100
=101x50
=5050
80-[30-(5-1)2]
=80-[30-4.2]
=80-[30-8]
=80-22
=58
34.{[(216+184):8]-42}
= 34.[(400:8)-42]
= 34.(50-42)
= 34.8
= 272
465+58+(-465)+(-78)
= (465-465)+(58-78)
= 0+(-20)
= -20
1+(-3)+5+(-7)+9+(-11)
= (1+5+9)-(3+7+11)
= 15-21
= -6
1+2+3+...+100=\(\frac{\left(100+1\right).100}{2}\)=5050
80-[30-(5-1).2]
= 80-(30-4.2)
= 80-(30-8)
= 80-30+8
= 50+8
= 58
Tính:
34 + 2 + 3 = … | 56 – 4 + 6 = … | 86 – 6 + 4 = … |
64 + 3 – 5 = … | 78 – 3 – 3 = … | 52 + 0 – 2 = … |
Lời giải chi tiết:
34 + 2 + 3 = 39 | 56 – 4 + 6 = 58 | 86 – 6 + 4 = 84 |
64 + 3 – 5 = 62 | 78 – 3 – 3 = 72 | 52 + 0 – 2 = 50 |
Giúp mình với nha
Bài 3. Tính hợp lý :
1) 84 + 245 + 16 2) 467 + 238 + 533 + 762 + 3465 3) 1 + 3 + 5 + 7 + … + 199 4) 8. 4. 34. 125. 25 5) (44. 52. 60) : (11. 13. 15) 6) 129. 172 – 73. 129 + 129 7) 78. 31 + 78. 24 + 22. 72 + 78. 17 | 8) 48. 55 + 52. 167 – 52. 112 9) 3. 25. 8 + 4. 6. 37 + 2. 38. 12 10) (2100 – 42) : 21 11) (64 + 27 + 28 + 29) : 32 12) 86. 8585 – 85. 8686 13) 1 - 2 + 3 - 4 + 5 - 6 + … + 101 14*) 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 +…+ 413 + 414 |
Bài 1:Thực hiện các phép tính sau
1) 78 +22+18
2) 94 +563+(106-563)-(-70)
3) 25.154-25+ 47.25
4) [5 mũ 29 +5 mũ 30 (16-11)]: 5 mũ 29 .
8) 25.2³- (9-14) + (29-34 +20)
1: \(78+22+18\)
\(=\left(78+22\right)+18\)
=100+18
=118
2: \(94+563+\left(106-563\right)-\left(-70\right)\)
\(=94+563+106-563+70\)
\(=\left(94+106\right)-\left(563-563\right)+70\)
=100-0+70
=170
3: \(25\cdot154-25+47\cdot25\)
\(=25\left(154-1+47\right)\)
\(=25\cdot200=5000\)
4: \(\left[5^{29}+5^{30}\left(16-11\right)\right]:5^{29}\)
\(=\left(5^{29}+5^{30}\cdot5\right):5^{29}\)
\(=\dfrac{5^{29}\cdot1+5^{29}\cdot5^2}{5^{29}}\)
\(=1+5^2=26\)
8: \(25\cdot2^3-\left(9-14\right)+\left(29-34+20\right)\)
\(=25\cdot8-\left(-5\right)+\left(-5\right)+20\)
\(=200+5-5+20\)
=220
so sánh phân số
3/2 ... 2/3
15/6 ... 5/2
4/3 ... 5/7
8/9 ... 1
3/2 ..>. 2/3
15/6 .=.. 5/2
4/3 ..>. 5/7
8/9 .<.. 1