3х:2.4=2.8
3х=2.8*2.4=6.72
х=6.72:3=2.24
1) (9102*4-26104)/8+8712=10000 2)(8301*6-36701)/5+7579=10200
21
×
18
------
168
21
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378|14
|
86:43=а:1; а=86*1:43; а=2
1)99+11=110+(88+22)=220+(33+77)=330+(44+66)=410
2) (350+250+105)=705 (459+111+28)=598 705-598=107
3) (450+50+20)=520 (450-50-20)=380 520+380=900
4) (95+45+12)=152 (91+19+42)=152 152-152=0