A) 4,2y+0,95=2,7y-59,8
4,2y-2,7y=-59,8-0,95
1,5y=-60,75
y=-60,75/1,5=-40,5
Проверка:
4,2*(-40,5)+0,95=2,7*(-40,5)-59,8
4,2*(-40,5)-2,7*(-40,5)=-59,8-0,95
-40,5(4,2-2,7)=-60,75
-40,5*1,7=-60,75
-60,75=60,75
б) 5(3/4):4(1/8)=b/33
23/4:33/8=b/33
23/4*8/33=b/33
23*2/33=b/33 23=b/33*33/2
23=b/2
b=23*2=46
Проверка:
23/4:33/8=46/33
23/4*8/33=46/33
23*2/33=46/33
23=46/33:2/33
23=46/33*33/2
23=46/2
23=23