Simple calculation of 28 × 72 + 28 × 28

28×72+28×28
＝28x(72+28)
=28x100
=2800

Simple calculation of 28 + 72 × 3

28+72×3
=28+72+72×2
=100+144
=244

Simple calculation of 0.28 * 0.72 + 0.72 * 0.72

0.28×0.72+0.72×0.72
=0.72×（0.28+0.72）
=0.72
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1, 4, 9, 16, 25 ，，64，81．

Because 1 + (3) = 4, 4 + (5) = 9, 9 + (7) = 16, 16 + (9) = 25, so 25 + (11) = 36, 36 + (13) = 49, or: 12 = 122 = 432 = 942 = 1652 = 25, so 62 = 3672 = 49

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Simple calculation of 28 × 72 + 28 × 28