7.5*2.3+1.9*2.5(简算)
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7.5*2.3+1.9*2.5(简算)
7.5*2.3+1.9*2.5(简算)
7.5*2.3+1.9*2.5(简算)
7.5*(1.9+0.4)+1.9*2.5
=7.5*1.9+7.5*0.4+1.9*2.5
=1.9*(7.5+2.5)+3
=19+3
=22
7.5*2.3+1.9*2.5(简算)
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