Question

Podręcznik Matematyka z plusem 3 zad 4 str 27:
a) 1⅞·(-6)=
b) -1⅕·2½=
c) -1¾÷8
d) 1⅓ ·0,5=
e)5,25 ÷(-1½)=
f) -1,5÷(-2⅓)
g) -1¾+ 7⅕=
h) -2⅜- jedna dwunasta

Answer 1

A).1 7/8*(-6)=15/8*(-6)= -45/4= -11 1/4
b).-1 1/5*2 1/2= -6/5*5/2= -3
c).-1 3/4:8= -7/4:8= -7/4*1/8= -7/32
d).1 1/3*0,5=4/3*1/2=2/3
e).5,25:(-1 1/2)=5,25:(-1,5)= -3,5
f).-1,5:(-2 1/3)=-1 1/2:(-2 1/3)= -3/2:(-7/3)= -3/2*(-3/7)=9/14
g).-1 3/4+7 1/5=-7/4+36/5= -35/20+144/20=109/20=5 9/20
h).-2 3/8-1/12= -2 9/24-2/24= -2 11/24

Answer 2

A) 1⅞·(-6)=15/8 * (-6/1) = - 11 1/4
b) -1⅕·2½= - 6/5 * 5/2 = -3
c) -1¾÷8 = - 7/4 * 1/8 = -7/32
d) 1⅓ ·0,5= 4/3 * 1/2 = 2/3
e)5,25 ÷(-1½)= 5 1/4 * (-2/3) = 21/4 * (-2/3) = - 7/2
f) -1,5÷(-2⅓)= 1 1/2 * 3/7 = 3/2 * 3/7 = 9/14
g) -1¾+ 7⅕=-1 15/20 + 7 4/20 = 5 9/20
h) -2⅜- 1/12 = - 2 9/24 - 2/24 = -2 11/24