Объяснение:

в) [1 18/25-9,12-7,4×(-6 1/3)]:5 1/3=7,4

1) 7,4×(-6 1/3)= - 74/10×19/3=

= -37/5×19/3= -703/15= -46 13/15

2) 1 18/25-9,12= 1,72-9,12= -7,4

3) -7,4-(-46 13/15)= -7,4+46 13/15=

= -7 4/10+46 13/15= -7 2/5+46 13/15=

= -7 6/15+46 13/15=39 7/15

4) 39 7/15:5 1/3=592/15:16/3=

=592/15×3/16=37/5=7 2/5=7,4

г) [7,42×5/9-(-11,48):1 4/5]:0,35=30

1) 7,42×5/9=7 42/100×5/9=7 21/50×5/9=

=371/50×5/9=371/90=4 11/90

2) -11,48:1 4/5= -11 48/100:9/5=

= -11 12/25×5/9= -287/25×5/9= -287/45=

= -6 17/45

3) 4 11/90-(-6 17/45)=4 11/90+6 34/90=

=10 45/90=10 1/2

4) 10 1/2:0,35=10,5:0,35=30