5 м2=5×5=25 м2
4 дм2=4×4=16 дм2
128:8 =16
160:5=32
288:6=48
256:4=64
400:5=80
384:4=96
= 1-2с^0.5+c^0.5*2 +2c^05=1+c^1=1+c
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1)90-54=36. 2)36:4=9. 3)9+9=18. 1)19-17=2. 2)2*7=14. 3)14+61=75
1) 15× 4-7х/15 +15× 1-х/3=15×4-15× 2х+1/5
4-7х+5 (1-х)=60-3 (2х+1)
4-7х+5-5х=60-6х-3
9-12х=57-6х
-12х+6х=57-9
-6х=48
х=-8
-х=8