4х+4у-3х=23
4х+у=23
у=23-4х
3(х+2(23-4х))-23+4х=27
3(х+46-8х)-23+4х=27
3х+138-24х-23+4х=27
-17х=27-115
-17х=-88
х=88:17
х=5 3\17
у=23-4х=23-4*88/17=23-692\17=23-40 12/17=-17 12\17
0.756²-0.241*0.756-0.415*0.756=0.756(0.756-0.241-0.415)=0.756*0.1=0.0756
0.25²*2.4+0.25*2.4²-0.25*2.4*0.65=0.25*2.4(0.25+2.4-0.65)=0.25*2.4*2=0.5*2.4=1.2
2.49*1.63-2.12*1.63+1.63²=1.63(2.49-2.12+1.63)=1.63*2=3.26
0.16*6.41*1.25-0.16*1.25²-0.16²*1.25=0.16*1.25(6.41-1.25-0.16)=0.16*1.25*5=1
1) 6 + (14-5)= 6 + 9 = 15
2)18 : (2+6) = 18 : 8 = 2,25
Нок (7, 21, 14)=7*2*3=42
7=7
21=3,7
14= 2, 7
21:3/7=21*7/3=49 кусков получилось