3.75乘29-29 *1.7 —— 24*125*9 = 9*3*1.25 = 32*25= 47*106+ 47*3-47*9=

问题描述:

3.75乘29-29 *1.7 —— 24*125*9 = 9*3*1.25 = 32*25= 47*106+ 47*3-47*9=

3.75乘29-29 *1.7 =29*(3.75-1.7)=29*2.05=59.45; 24*125*9 = =3*8*125*9=27*1000=27000;9*3*1.25 =(8+1)*3*1.25=30+3.75=33.75; 32*25=8*4*25=800; 47*106+ 47*3-47*9=47*(106+3-9)=4700