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b)3√25×2 + 2√2×16 - 4√100×2= 3×5√2 + 2×4√2 - 4×10√2= 15√2 + 8√2 - 40√2= 63√2
c)130×10^4 - 2,5×10^4= 127,5×10^4= 1275000
2. a){6x-9y=6/:3
{8x+5y=7/3 /×3
{2x-3y=2
{24x+15y=7
{2x=2+3y/:2
x=1+3/2 y
{24(1+3/2 y) +15y=7
24+36y+15y=7
51y=7-24
51y=-17/:51
y=-17/51
x=1+3/2 × (-17/51)= 1-51/102= 1- 1/2= 1/2
spr: {6×(1/2)-9×(-17/51)=3+153/51=3+3=6
{8×1/2+5×(-17/51)=4-85/51=4-1 34/51=3 51/51-1 34/51=2 17/51=2 1/3= 7/3