1/7 - 2,5 = 1/7 - 25/10 = 1/7 - 5/2 = 2/14 - 35/14 = - 33/14 = - 2целых 5/14
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1 1/2 - 0,5 = 3/2 - 5/10 = 3/2 - 1/5 = 15/10 - 2/10 = 13/10 = 1целая 3/10
850-100%
?-32%
850:100x32=8,4x32=268,8
850-268,8=581.2
А) 9²+19=9×9+19=81+19=100
б) 17²-209=17×17-209=289-209=80
в) 6³:3=6×6:3=36:3=12
г) 2³·3²=2×2×2×3×3=8×9=72
Крест-накрест
5) 3*2(х+31)=21*14
6х+186=294
6х=294-186
6х= 108
х=108:6
х=18
6) 9*5(х+8)=10*63
45х+360=630
45х=630-360
45х=270
х=270:45
х=6
ответ 1.08! 3.5*0.13=0.455 0.9464/0.455=2.08 2.08+3.92=6 6*0.18=1.08