<span>308:4+3*9-29=77+27-29=75
</span><span>308:4+(3*9-29)=77+(-2)=75
</span><span>308:(4+3)*9-29=308:7*9-29=44*9-29=396-29=367
</span><span>308:(4+3)*(9-29)=308:7*(-20)=44*(-20)=-880</span>
<span><span>3952/280
</span><span>280 /14.1(142857)
------
</span><span>-1152
</span><span>1120</span><span>
--------
-320</span><span>
280
---------
</span><span>-400</span><span>
280</span><span>
-----------
-1200</span><span>
1120</span><span>
----------
-800</span><span>
560</span><span>
-----------
-2400</span><span>
2240</span><span>
----------
-1600</span><span>
1400</span><span>
----------
-2000</span><span>
1960</span><span>
---------------
4<span>0
</span></span></span>
1) 3,711 х + 0,289 х = 4 х
2) х = 800,4 : 4= 200,1
Ответ: х = 200,1
456 - 892 = - 436.
Можно и на калькуляторе посчитать.