1) х×56+126=2142
56х+126=2142
56х=2016/ :56
х=36
2) х-3419=652×8
х-3419=5216
х=5216+3419
х=8635
3) (7000-2065):х=7
4935:х=7
х=4935:7
х=705
4) х:28=7084:46
х:28=154
х=154×28
х=4312
1440-(480:6)=1370
не 128 а 1330
1) 480:6=70
2)1440-70=1370
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
X - 0.688X = 0.312X
X = 27 0.312*27 = 8.424
X = 1000 0.312 * 1000 = 312
X = 10000 0.312 * 10000 = 3120
26,1-5,8x=8,7
5,8x=26,1-8,7
5,8x=17,4
x=17,4:5,8
x=3