54X0.38+3.8X4.6简算?
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54*0.38
=0.38*(50+4)
=0.38*50+0.38*4
=19+1.52
=20.52
3.8x4.6
=2.8x4.6+1x4.6
=(4-0.2)x4.6
=4x4.6-0.2x4.6
=18.2-0.92
=17.48
=0.38*(50+4)
=0.38*50+0.38*4
=19+1.52
=20.52
3.8x4.6
=2.8x4.6+1x4.6
=(4-0.2)x4.6
=4x4.6-0.2x4.6
=18.2-0.92
=17.48
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