Question

calculati: a) {62+[12×(27×23-22×24)-987]:3}:15=...........

b) {[1+2×(3+3×15)]×6+9}×3-2013

c) [(8+8÷8)÷9+(9+9÷9)÷10-1]+456

dau 100000 de inimi

Answer 1

a) {62+[12x(27x23-22x24)-987]:3}:15=
={62+[12x(621-528)-987]:3}:15
=[62+(12x93-987):3]:15
=[62+(1116-987):3]:15
=(62+129:3):15
=(62+43):15
=105:15
=7

b){[1+2x(3+3x15)]x6+9}x3-2013=
={[1+2x(3+45)]x6+9}x3-2013
=[(1+2x48)x6+9]x3-2013
=[(1+96)x6+9]x3-2013
=(97x6+9)x3-2013
=(582+9)x3-2013
=591x3-2013
=1773-2013
=(-240)

c)[(8+8:8):9+(9+9:9):10-1]+456=
=[(8+1):9+(9+1):10-1]+456
=(9:9+10:10-1)+456
=(1+1-1)+456
=(2-1)+456
=1+456
=457