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Lời giải chi tiết:
57 – 7 < 57 – 4 | 34 + 4 > 34 – 4 |
70 – 50 = 50 – 30 | 65 – 15 > 55 – 15 |
![](https://rs.olm.vn/images/avt/0.png?1311)
13 x 27 + 13 x 70 + 13 x 4 - 13 = 13(27+70+4-1) = 13 x 100 = 1300
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100+90+80+70+60+50+40+30+20+10+1+2+3+4+5+6+7+8+9=?
100+90+80+70+60+50+40+30+20+10+1+2+3+4+5+6+7+8+9=595
tk mk
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\(55+60+45+30+40+70\)
\(=\left(55+45\right)+\left(60+40\right)+\left(30+70\right)\)
\(=100+100+100=300\)
\(4+20+6+80=\left(4+6\right)+\left(20+80\right)=10+100=110\)
a) \(55+60+45+30+40+70\)
\(=\left(55+45\right)+\left(60+40\right)+\left(30+70\right)\)
\(=100+100+100\)
\(=100.3=300\)
b) \(4+20+6+80\)
\(=\left(4+6\right)+\left(20+80\right)\)
\(=10+100=110\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
a) 66 - 60 = 6 98 - 90 = 8 72 - 70 = 2
78 - 50 = 28 59 - 30 = 29 43 - 20 = 23
b) 58 - 4 = 54 67 - 7 = 60 99 - 1 = 98
58 - 8 = 50 67 - 5 = 62 99 - 9 = 90
![](https://rs.olm.vn/images/avt/0.png?1311)
\(21,5\times4-y=70\)
\(86-y=70\)
\(y=86-70\)
\(y=16\)
21,5x4-y=70
=> 86x4-y=70
=> 344-y=70
=> y=344-70
=> y=274
vậy y=274
Knha