<span>d+1/5=4/7+3/7</span>
<span>д+1/5=7/7</span>
<span>д=1-1/5</span>
<span>д=4/5</span>
<span>
</span>
<span><span>f+4/5=4/7+3/7</span></span>
<span><span>f+4/5=7/7</span></span>
<span><span>f=1-4/5</span></span>
<span><span>f=1/5</span></span>
<span><span>
</span></span>
<span><span><span>b+2/5=4/7+3/7</span></span></span>
<span><span><span>b+2/5=7/7</span></span></span>
<span><span><span>b=1-2/5</span></span></span>
<span><span><span>b=3/5</span></span></span>
6а2-3а+11+3а+а3-7=а3+6а2+18
1кг=100г
500+200=700
1700-700=1000
100*4=4000 )
1) 15-12= 3
2) 27:3=9(кгв 1 ящике)
3)15+12=27
4) 27 умножить на 9= 243 кг
8,7+13,7-15,2-24,6+20,1=
1)8,7+13,7=22,4
2)22,4-15,2=7,2
3)7,2-24,6=-17.4
4)-17,4+20,1=2,7