4) 5/18=0.2777777778=0.28
5)
а) (3-15/28×7/6)×40/19=
=(3-5/4×1/2)×40/19=
=(3-5/8)×40/19=
=(24/8-5/8)×40/19=
=19/8×40/19=
=1/1×5/1=
=5
б) (92/27-53/18)÷50/27+18/5×1/3=
=(184/54-159/54)÷50/27+6/5×1/1=
=25/54×27/50+6/5=
=1/6×3/2+6/5=
=1/2×1/2+6/5=
=1/4+6/5=
=5/20+24/20=
=29/20=
=145/100=
=1.45
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Answers & Comments
4) 5/18=0.2777777778=0.28
5)
а) (3-15/28×7/6)×40/19=
=(3-5/4×1/2)×40/19=
=(3-5/8)×40/19=
=(24/8-5/8)×40/19=
=19/8×40/19=
=1/1×5/1=
=5
б) (92/27-53/18)÷50/27+18/5×1/3=
=(184/54-159/54)÷50/27+6/5×1/1=
=25/54×27/50+6/5=
=1/6×3/2+6/5=
=1/2×1/2+6/5=
=1/4+6/5=
=5/20+24/20=
=29/20=
=145/100=
=1.45