3.8✘0.45+0.35✘4.2+0.038✘13怎样简便?
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3.8×0.45+0.35×4.2+0.038×13
=3.8×0.45+0.038×100×0.13+0.35×4.2
=(3.8×0.45+3.8×0.13)+0.35×4.2
=3.8×(0.45+0.13)+0.35×4.2
=3.8×0.58+0.35×4.2
=0.58×(4.2-0.4)+4.2×0.35
=4.2×0.58-0.58×0.4+4.2×0.35
=4.2×(0.58+0.35)-0.58×0.4
=4.2×0.93-0.58×0.4
=4.2-4.2×0.07-0.232
=4.2-0.294-0.232
=4.2-0.526
=4.674
=3.8×0.45+0.038×100×0.13+0.35×4.2
=(3.8×0.45+3.8×0.13)+0.35×4.2
=3.8×(0.45+0.13)+0.35×4.2
=3.8×0.58+0.35×4.2
=0.58×(4.2-0.4)+4.2×0.35
=4.2×0.58-0.58×0.4+4.2×0.35
=4.2×(0.58+0.35)-0.58×0.4
=4.2×0.93-0.58×0.4
=4.2-4.2×0.07-0.232
=4.2-0.294-0.232
=4.2-0.526
=4.674
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=3.8*0.45+0.35*4.2+0.038*13
=3*8*0.45+0.35*4.2+3.8*0.13
=3.8*(0.45+0.13)+0.35*4.2
=3.8*0.58+0.35*4.2
=3.674
=3*8*0.45+0.35*4.2+3.8*0.13
=3.8*(0.45+0.13)+0.35*4.2
=3.8*0.58+0.35*4.2
=3.674
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3.8×0.45+0.38×4.2+0.038×13
=3.8×(0.45+0.42+0.13)
=3.8×1
=3.8
=3.8×(0.45+0.42+0.13)
=3.8×1
=3.8
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3.8×0.45+0.35×4.2+0.038×13
=3.8×(0.45+0.13)+0.35×4.2
=3.8×0.58+0.35×4.2
=2.204+1.47
=3.674
=3.8×(0.45+0.13)+0.35×4.2
=3.8×0.58+0.35×4.2
=2.204+1.47
=3.674
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