Упростите выражение А) -2х+3х-5х Б) 2а-5-а+4

1+1-1+1=2
1+1+1+1=4
1+1-1+1=3
Все :)

<span><span>−5x2+21x−18</span>2x2−3x</span>=<span>0
</span><span><span>−5x2+21x</span>−18</span>=<span>0
</span><span><span>(<span>−5x+6</span>)</span>(x−3)</span>=<span>0
</span><span><span><span>−5x</span>+6</span>=<span><span><span>0 or </span>x</span>−3</span></span>=<span>0
</span><span>x=<span><span><span>65</span><span> or </span></span>x</span></span>=<span>3</span>

1. 1целая 1/12
2. 1 целая 13/45
3. 1 целая 121/189

28:4+27:3-(17+31):6=7+9-8=16
1)17+31=48
2)48:6=8
3)28:4=7
4)27:3=9
5)7+9=16
6)16-8=8

54:9+(8+19):3-32:4=6+9-8=7
1)8+19=27
2)27:3=9
3)54:9=6
4)32:4=8
5)6+9=15
6)15-8=7

(8*6-36:6):6*3+5*9=21+45=66
1)8*6=48
2)36:6=6
3)48-6=42
4)42:6=7
5)7*3=21
6)5*9=45
7)21+45=66

21:7+ (42-14):4 - (44-14):5=3+7-6=4
1)42-14=28
2)28:4=7
3)44-14=30
4)30:5=6
5)21:7=3
6)3+7=10
7)10-6=4