如题所述
8 ×0.7×2×0.7÷0.7÷0.7
=8×2
=16
=8×2
=16
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第1个回答 2013-11-19
(2.8× 0.7)×2÷0.49
=(4×0.7×0.7)×2÷0.49
=(8×2)×(0.49÷0.49)
=16
=(4×0.7×0.7)×2÷0.49
=(8×2)×(0.49÷0.49)
=16
第2个回答 2013-11-19
=8*0.7*0.7*2/0.49=.8*2*0.49/0.49=16