Question

递等式计算:（能简则简）3.9－4.1＋6.1－5.9 1.96×18＋196×0.72 （25＋2.5＋

递等式计算:（能简则简）3.9－4.1＋6.1－5.9 1.96×18＋196×0.72 （25＋2.5＋0.25）×4 4.31×0.99 3.7×3.7＋3.7×7.3－3.7
递等式计算:（能简则简）3.9－4.1＋6.1－5.9 1.96×18＋196×0.72 （25＋2.5＋0.25）×4 4.31×0.99 3.7×3.7＋3.7×7.3－3.7

Answer 1

3.9－4.1＋6.1－5.9
=(3.9-4.1)+(6.1-5.9)
=-0.2+0.2
=0
1.96×18＋196×0.72
=196*0.18+196×0.72
=196×(0.18+0.72)
=196×0.9
=176.4
（25＋2.5＋0.25）×4
=25×4+2.5×4+0.25×4
=100+10+1
=101
4.31×0.99
=4.31×(1-0.01)
=4.31-4.31×0.01
=4.31-0.0431
=4.30569
3.7×3.7＋3.7×7.3－3.7

=3.7×(3.7+7.3-1)
=3.7×10
=37

Answer 2

3.9－4.1＋6.1－5.9 =（3.9+6.1）-（4.1+5.9）=10-10=0
1.96×18＋196×0.72 =196*0.18+196*0.72=196*（0.18+0.72）=196*0.9=175.4

（25＋2.5＋0.25）×4 =25*4+2.5*4+0.25*4=100+10+1=111
4.31×0.99 =4.31*（1-0.01）=4.31*1-4.31*0.01
=4.31-0.0431=4.2669
31.7×3.7＋3.7×7.3+3.7=
3.7*（31.7+7.3+1）=3.7*40=148

Answer 3

3.9－4.1＋6.1－5.9
=(3.9-4.1)+(6.1-5.9)
=-0.2+0.2
=0
1.96×18＋196×0.72
=196×0.18+196×0.72
=196×(0.18+0.72)
=196×0.9
=176.4
（25＋2.5＋0.25）×4
=25×4+2.5×4+0.25×4
=100+10+1
=111
4.31×0.99
=4.31×(1-0.01)
=4.31-4.31×0.01
=4.31-0.0431
=4.2669
3.7×3.7＋3.7×7.3－3.7
=3.7×(3.7+7.3-1)
=3.7×10
=37