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a=90cm
b=0,6m=60cm
h=0,4m=40cm
P=1/2(a+b)*h=1/2(90+60)*40=3 000cm²
b]
a=50cm=5dm
b=30cm=3dm
c=20cm=2dm
h=wysokosc poziomu wody=1/2c=1dm
v wody=abh=5*3*1=15dm³[ litrów]
1 litr ma masę 1 kg
masa wody=15 kg
c]
(x+4);3=x
d]
-5x=3x+8
-5x-3x=8
-8x=8
x=8:(-8)
x=-1
.............
spr.
-5*(-1)=3*(-1)+8
5=-3+8
5=5
L=P