\(a,=43+\left(2-5\right)\\ =43+\left(-3\right)\\ =40\\ b,=2.\left[19+\left(12:2^2\right)+5\right]\\ =2.\left(19+3+5\right)\\ =2.27=54\\ c,=15-15:\left(6-\left(3-2\right)\right)\\ =15-15:\left(6-1\right)\\ =15-15:5\\ =15-3\\ =12\)
`a, 43 + 8 - 2 - 3`
`= 43 + 8 - 5`
`= 46`
`b, 2{19+[12:(4-2)^2]+5}`
`= 2.{19 + [12 : 4]+5}`
`= 2 . {19+3+5}`
`= 2 . 27`
`= 54`
`c, 15 - 15 : [6-(1.3-2)]`
`= 15 - 15 : 6`
`= 15 - 2,5`
`= 12,5`
a,43+8−2−3a,43+8-2-3
=43+8−5=43+8-5
=46=46
b,2{19+[12:(4−2)2]+5}b,2{19+[12:(4-2)2]+5}
=2.{19+[12:4]+5}=2.{19+[12:4]+5}
=2.{19+3+5}=2.{19+3+5}
=2.27=2.27
=54=54
c,15−15:[6−(1.3−2)]c,15-15:[6-(1.3-2)]
=15−15:6=15-15:6
=15−2,5=15-2,5
=12,5
a,=43+(2−5)=43+(−3)=40b,=2.[19+(12:22)+5]=2.(19+3+5)=2.27=54c,=15−15:(6−(3−2))=15−15:(6−1)=15−15:5=15−3=12
