简便计算72×1.25-64×1.25 3.97×72+39.7×2.14
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72×1.25-64×1.25
=9x8x1.25-8x8x1.25
=9x10-8x10
=90-80
=10
3.97×72+39.7×2.14
=3.97x(72+21.4)
=3.97x93.4
=4x93.4-0.03x93.4
=373.6-2.812
=373.6-3+0.188
=370.788
=9x8x1.25-8x8x1.25
=9x10-8x10
=90-80
=10
3.97×72+39.7×2.14
=3.97x(72+21.4)
=3.97x93.4
=4x93.4-0.03x93.4
=373.6-2.812
=373.6-3+0.188
=370.788
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第一题:
72×1.25-64×1.25
=(72-64)×1.25
=8*1.25
=10
(8×1.25可用(8×125÷100),8×125=1000应该背过)
第二题:
3.97×72+39.7×2.14
=3.97×72+3.97×21.4
=(21.4+72)×3.97
=93.4×3.97
=93.4×4-93.4×0.03
=373.6-2.802
=370.798
72×1.25-64×1.25
=(72-64)×1.25
=8*1.25
=10
(8×1.25可用(8×125÷100),8×125=1000应该背过)
第二题:
3.97×72+39.7×2.14
=3.97×72+3.97×21.4
=(21.4+72)×3.97
=93.4×3.97
=93.4×4-93.4×0.03
=373.6-2.802
=370.798
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