80÷16×2=160÷16=10
57÷(76÷4)=57÷19=3
84÷(42÷2)×3=84÷21×2=4×3=12
250+430-300=680-300=380
(530+10)÷9÷60=540÷9÷60=60÷60=1
420÷7+599=60+599=659
=3,86*0,1+32,35:100=0,386+0,3235=0,7095
( 921*8-25290/6)/3-251 =800
1) 921*8 = 7368
2) 25290/6 = 4215
3) 7368 - 4215 = 3153
4)3153/3=1051
5)1051-251=800
10*(23067/9+55560/8)/4=23770
1)23067/9=2563
2)55560/8= 6945
3)2563+6945 = 9508
4)9508*10=95080
5)95080/4=23770
(714*3-1142)*(25428/4-50382/9)=759000
1)714*3=2142
2)2142-1142=1000
3)25428/4=6357
4)50382/9=5598
5)6357-5598=759
6)1000*759=759000
1, 2, 3, 6, 7, 14, 21, 42<span>.</span>
-y=-2/5-3/7
y=2/5+3/7
y=14/35+15/35
y=29/35