∫2,1(3x-1)dx=|2,1(1,5x^2-x)=1,5*2^2-2-(1,5-1)=4-0,5=3,5
659- (345 - x)= 427
659 - 345 + x = 427
314 + x = 427
x = 113
10/х=-5/3-6
10/х=-5/3-18/3
10/х=-23/3
х=10: (-23/3)
х=10*(-3/23)
х=-30/23
х=-1 7/23
420:x=7
X=420:7
X=60
A*16=96
A=96:16
A=6
1) 234 и 239 235,236,237,238
<span>3) 7564 и 7566 7565</span>
2) 1518 и 1524 1519,1520,1521,1522,1523
4) 32025 и 32030 32026,32027,32028,32029