3.a)420=28×l
420÷28=l
15=l
b) K=2×(28+15)
=2×43=86
no 4 aku gapaham soalnya maaf
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3.a)420=28×l
420÷28=l
15=l
b) K=2×(28+15)
=2×43=86
no 4 aku gapaham soalnya maaf