简便算如下!数学的简便算!求简便算法、式!急急!第一题列递等式：5.2*49+4.9*48 =第二题列递等式[智力乐园]：15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12 =

5.2*49+4.9*48
= 49*(5.2+4.8)
=490
15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12=6.88*(15.37-9.37)+3.12*(15.37-9.37)
=6*(6.88+3.12)
=60

5.2*49+4.9*48=5.2*49+49*4.8=49*(5.2+4.8)=49*10=490
15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
=(15.37-9.37)*6.88+(15.37-9.37)*3.12=6*6.88+6*3.12=6*(6.88+3.12)=6*10=60

1
=52*4.9+4.9*48=4.9（52+48）=4.9*100=490
2
=15.37*6，88+15.37*3.12-9.37*6.88-9.37*3.12
=15.37*（6.88+3.12）-9.37*（6.88+3.12)
=153.7-93.7=60

5.2*49+4.9*48
=5.2*49+4.8*49
=(5.2+4.8)*49
=10*49=490
15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
=(15.37-9.37)*6.88+(15.37-9.37)*3.12
=(15.37-9.37)*(6.88+3.12)
=6*10=60
祝你学习进步

1 . 5.2*49+4.9*48
=5.2*4.9*10+4.9*48
=4.9*(52+48)
=4.9*100
=490
2. 15.37*6.88-9.37*6.88+15.37*3.12-9.37*3.12
= 6.88*(15.37-9.37)+3.12(15.37-9.37)
=(6.88+3.12)(15.37-9.37)
=10*6
=60