B4.(3*3+2*4+2*4+2*3+5)/50=36/50=0,72 A
(3*4+2*3+2*4+2*4+3)/50=37/50=0,74 Б
(3*5+2*2+2*3+2*3+2)/50=33/50=0,66 B
Ответ Б
В5. 4^2-x=4^3,2-x=3, x=-1
B6.AB²=AC²+BC²-2AC*BC*cosC
cosC=√(1-15/16)=1/4
AB²=144+144-2*12*12*1/4=288-72=216
AB=6√6
9,3а-90b+0,7a=10a-90b=10×30-90×0,2=300-18=282
<span>54-x=27</span>
<span>х=54-27</span>
<span>х=27</span>
<span>54-27=27</span>
<span><span>x-33=39</span></span>
<span><span>х=39+33</span></span>
<span><span>х=72</span></span>
<span><span>72-33=39</span></span>
<span><span><span>28+x=34</span></span></span>
<span><span><span>х=34-28</span></span></span>
<span><span><span>х=6</span></span></span>
<span><span><span>28+6=34</span></span></span>
8704 + х = 89 * (57269 - 49993)
57269
- <u> 49993</u>
7276
8704 + х = 89 * 7276
7276
<u>* 89</u>
65484
<u> + 58208</u><u>
</u> 123692
8704 + х = 123692
х = 123692 - 8704
123692
- <u> 8704</u>
114988
х = 114988
<u />
4х-3х=101
х=101
ответ : х=101