Question

简便计算求解答

5.5乘4.4-4.4乘3.3-4.4乘2.2

0.00695乘2500+69.5乘0.24+5.1乘6.95

4.7乘2.8+2.5乘2.8+7.2乘7.2

Answer 1

简便计算求解答
5.5乘4.4-4.4乘3.3-4.4乘2.2
=（5.5-3.3-2.2）×4.4
=0×4.4
=0

0.00695乘2500+69.5乘0.24+5.1乘6.95
=6.95×2.5+6.95×2.4+5.1×6.95
=6.95×（2.5+2.4+5.1）
=6.95×10
=69.5

4.7乘2.8+2.5乘2.8+7.2乘7.2
=（4.7+2.5）×2.8+7.2×7.2
=7.2×2.8+7.2×7.2
=7.2×（2.8+7.2）
=7.2×10
=72

Answer 2

5-5*4.4-4.4*3.3-4.4-2.2=5.5*4.4-（4.4*3.3+4.4*2.2）=0
0.00695*2500+69.5*.24+5.1*6.95=0.695*25+0.695*24+0.695*51=0.695*（24+24+51）
=0.695*100=69.5
4.7*2.8+2.5*2.8+7.2*7.2=（4.7+2.5）*2.8+7.2*7.2=7.2*2.8+7.2*7.2=7.2*（2.8+7.2）=72