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350-50*3/5+7,4:37/40=
= 350 - 10 * 3/1 + 7 i 4/10 : 37/40=
= 350 - 30/1 + 74/10 * 40/37 =
= 350 - 30 + 2/1 * 4/1=
= 320 + 8/1 =
= 320 + 8=
= 328
b)
420-20*3/4+6,25:5/8=
= 420 - 5 * 3/1 + 6 i 25/100 : 5/8=
= 420 - 15/1 + 6 i 1/4 : 5/8=
= 420 - 15 + 25/4 * 8/5=
= 405 - 5/1 * 2/1 =
= 405 - 10/1=
= 405 - 10=
= 395