tolong jawab pake cara ya :))

no 12 = L1=6×8=48
L2 = 1/2×4×3=6 (jadi jawaban 48-6= 42) A

no 13 = 20×25=500 (jadi jawaban 500) D

no 14 = 1/2×( 60+40 )×30 = 1500 (jadi jawan 1500) C

no 15 = L1=1/2×(20+30)×14= 350
L2= 1/2×22/7×7×7= 77( jadi jawaban 350-77= 273) B