简算6.25 *2.8+4.

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简算6.25*2.8+4.简算6.25*2.8+4.简算6.25*2.8+4.原式=6.25×4×0.7+6×0.7=0.7×(25+6)=0.7×31=21.76.25*2.8+4.2=(6+0.2

简算6.25 *2.8+4.
简算6.25 *2.8+4.

简算6.25 *2.8+4.
原式=6.25×4×0.7+6×0.7
=0.7×(25+6)
=0.7×31
=21.7

6.25 *2.8+4.2
=(6+0.25)*4*0.7 +6*0.7
=(24+1+6)*0.7
=31*0.7
21.7