28×0.37+3.7×7.2
=28×0.37+0.37×10×7.2
=0.37×(28+10×7.2)
=0.37×(28+72)
=0.37×100
=37
28×0.37+3.7×7.2
=3.7×(2.8+7.2)
=3.7×10
=37
28×0.37+3.7×7.2
=2.8×3.7+3.7×7.2
=3.7×(2.8+7.2)
=3.7×10
=37
28×0.37+3.7×7.2
=2.8×3.7+3.7×7.2
=3.7×<2.8+7.2>
=3.7×10
=37
28×0.37+3.7×7.2=37