27930/57
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228 490
-----
513
513
----------
0
1) <span>x+(619 - 392) = 719 +320
x + 227 = 1039
x = 1039 - 227
x = 812
2) 120 + 880 - x = 56 * 50
1000 - x = 2800
x = 1000 - 2800
x = -1800
3) x* ( 94 - 78 ) = 893 + 707
16x = 1600
x = 100
4) 5 * 25 : x = 890 - 865</span>
125 : x = 25
x = 125 : 25
<span> x = 5
</span>
1)4 3/8÷5 1/4=35/8÷21/5=
35/8*5/21=25/24
2)4 5/8-25/24=37/8-25/24=111/24-25/24=86/24=43/12=3 7/12
3)3/4*2 2/3=3/4*8/3=2
4)3 7/12-2=1 7/12