1. 9z + z = 500
10z = 500
z = 500:10
z = 50
Ответ: 50.
2. 10k - k = 702
9k = 702
k = 702:9
k = 78
Ответ: 78.
X²+8x+15=(x+5)(x+3)
x1+x2=-8 U x1*x2=15⇒x1=-5 U x2=3
(x+5)(x-a)=(x+5)(x+3)
a=-3
240:12=20(кг)
20*15=300(кг)
97538+238475=336013
204352:992=206
7296•49=357504
70001-36527=33474
608226:67=9078
103226-97885=5341
3296:8+412•99=412+40788=41200
(1848:6-196)•99=(308-196)•99=112•99=11088
(1848:6-196)•46=(308-196)•46=112•46=5152