71乘40%加28乘五分之二加0.4(简算)

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71乘40%加28乘五分之二加0.4(简算)
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71乘40%加28乘五分之二加0.4(简算)
71乘40%加28乘五分之二加0.4(简算)

71乘40%加28乘五分之二加0.4(简算)
71×40%+28×2/5+0.4
=0.4×(71+28+1)
=0.4×100
=400

71*0.4+28*0.4*0.4=(71+28+1)*0.4