Question

0.98x3.2用简便方法计算

0.98x3.2用简便方法计算还有2.5x4.4x0.7也要用简便方法计算。我很急啊

Answer 1

0.98x3.2=（1-0.02）*3.2=3.2-0.064=3.3162.5x4.4x0.7=（2.5*4+2.5*0.4）*0.7=1.1*0.7=0.77

Answer 2

0.98×3.2=（1-0.02）×3.2=1×3.2-0.02×3.2=3.2-0.064=3.1362.5x4.4x0.7=2.5x（4+0。4）x0.7=［2.5x4+（2.5x0.4）］x0.7=（10+1）x0.7=7.7

Answer 3

（1-0.02）*3.2=3.2-0.02*3.2=3.2-0.064=3.1362.5*4.4*0.7=2.5*4*1.1*0.7=10*0.77=7.7

Answer 4

0.98x3.2=(1-0.02)×3.2=3.2-0.064=3.136