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V=phi.r².t
1540=22/7.10.t²
1540=220/7.t²
t²=1540.7/220
t²=10780/220
t²=49
t=7 dm(A)
Nomor 2
Caranya disamakan penyebutnya. Yg berada di dalam kurung di dahulukan dikerjakan, lalu yg bagi/kali
9/2-30/12:(5/2+5/4)
9/2-30/12:15/4
9/2-30/12x4/15
9/2-2/3
23/6(B)
49 =r² = √49 = 7
a.7