- −1.09x+63xy2+25xy2
-1.09 • 2+63 •(2•0.2)2+25•(2•0.2)2=-2.18+88•4•1/25=-109/50+88•4•1/25=-109/50+352/25=119/10 - 0.13a2−0.08b2 0.4a2+0.03b2 (0.4a2+0.03b2)+(0.13a2−0.08b2)=0.4a2+0.03b2+0.13a2-0.08b2=0.53a2-0.05b2
0.4a2+0.03b2)-(0.13a2-0.08b2)=0.27a2+0.11b2
3.
(10•3x+x)-(10x+3x)=36
31x-13x=36
18x=36
x=2
10•3x+x=62
4.
(8y+1)⋅(2y−5)=(16y−6)(y+1)
16y2-40y+2y-5=16y2+16y-6y-6
-48y=-1
Y=1/48
5.
m2+n2=(m+n)2−2mn
m2+n2=m2+2mn+n2-2mn
m2+n2=m2+n2
- (0.2d+c3)⋅(0.04d2−0.2dc3+c6)
0.008d3-0.04d2c3+0.2dc3+0.04d2c3-0.2dc6+c9=0.008d30.04d2c3-0.2dc6+c9
7.
(7−1)(7+1)(7(2)+1)(7(4)+1)(7(8)+1)−7(16)+35
(7(2)-1)(7(2)+1)(7(4)+1)(7(8)+1)-7.16+35
(7(4)-1)(7(4)+1)(7(8)+1)-7(16)+35
(7(8)-1)(7(8)+1)-7(16)+35
7.16-1-7(16)+35=34
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