脱式计算、(能简算的简算) 201×0.65-0.65 3.6×0.7×2.5 6
脱式计算、(能简算的简算)201×0.65-0.653.6×0.7×2.56.44×3.7+6.44×6.31.25×39.5×0.8....
脱式计算、(能简算的简算) 201×0.65-0.65 3.6×0.7×2.5 6.44×3.7+6.44×6.3 1.25×39.5×0.8.
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(1)201×0.65-0.65,
=(201-1)×0.65,
=200×0.65,
=130;
(2)3.6×0.7×2.5,
=4×0.9×0.7×2.5,
=(0.9×0.7)×(2.5×4),
=0.63×10,
=6.3;
(3)6.44×3.7+6.44×6.3,
=6.44×(3.7+6.3),
=6.44×10,
=64.4;
(4)1.25×39.5×0.8,
=(1.25×0.8)×39.5,
=1×39.5,
=39.5.
=(201-1)×0.65,
=200×0.65,
=130;
(2)3.6×0.7×2.5,
=4×0.9×0.7×2.5,
=(0.9×0.7)×(2.5×4),
=0.63×10,
=6.3;
(3)6.44×3.7+6.44×6.3,
=6.44×(3.7+6.3),
=6.44×10,
=64.4;
(4)1.25×39.5×0.8,
=(1.25×0.8)×39.5,
=1×39.5,
=39.5.
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