0.25*0.87*4
=0.25*4*0.87
=1*0.87
=0.87
1.25*0.25*8*4
=(1.25*8)*(0.25*4)
=10*1
=1
0.2*0.63*5
=0.2*5*0.63
=1*0.63
=0.63
(40+4)*2.5
=40*2.5+4*2.5
=100+10
=110
(100+8)*12.5
=100*12.5+8*12.5
=1250+100
=1350
0.86*(10-2)
=0.86*10-0.86*2
=8.6-1.72
=6.88
7.6*0.8+0.2*7.6
=7.6*(0.8+0.2)
=7.6*1
=7.6
1.28*8.6+0.72*8.6
=(1.28+0.72)*8.6
=2*8.6
=17.2
0.86*15.7-0.86*14.7
=0.86*(15.7-14.7)
=0.86*1
=0.86
0.325*0.8+1.1*0.325-0.325*0.9
=0.325*(0.8+1.1-0.9)
=0.325*1
=0.325
3.6-3.6*0.5
=3.6*1-3.6*0.5
=3.6*(1-0.5)
=3.6*0.5
=1.8
2.3*99+2.3
=2.3*99+2.3*1
=2.3*(99+1)
=2.3*100
=230
0.87*9.9+1.1*0.87-0.87
=0.87*(9.9+1.1-1)
=0.87*10
=8.7
4.32-4.32*0.9
=4.32*1-4.32*0.9
=4.32*(1-0.9)
=4.32*0.1
=0.432
0.87*101
=0.87*(100+1)
=0.87*100+0.87*1
=87+0.87
=87.87
0.23*9.9
=0.23*(10-0.1)
=0.23*10-0.23*0.1
=2.3-0.023
=2.277
56*10.1
=56*(10+0.1)
=56*10+56*0.1
=560+5.6
=565.6
8.5*98
=8.5*(100-2)
=8.5*100-8.5*2
=850-17
=833
0.36*3400+36*66
=0.36*3400+0.36*6600
=0.36*(3400+6600)
=0.36*10000
=3600
32.5*1130-325*13
=32.5*1130-32.5*130
=32.5*(1130-130)
=32.5*1000
=32500
以上題目考察簡便運算的知識點包括:
乘法交換率、乘法分配率、乘法分配率的逆運算、添加因數“1”、拆分法和小數點移動法。
解答完畢!
0.25*0.87*4
=0.25*4*0.87
=1*0.87
=0.87
1.25*0.25*8*4
=(1.25*8)*(0.25*4)
=10*1
=1
0.2*0.63*5
=0.2*5*0.63
=1*0.63
=0.63
(40+4)*2.5
=40*2.5+4*2.5
=100+10
=110
(100+8)*12.5
=100*12.5+8*12.5
=1250+100
=1350
0.86*(10-2)
=0.86*10-0.86*2
=8.6-1.72
=6.88
7.6*0.8+0.2*7.6
=7.6*(0.8+0.2)
=7.6*1
=7.6
1.28*8.6+0.72*8.6
=(1.28+0.72)*8.6
=2*8.6
=17.2
0.86*15.7-0.86*14.7
=0.86*(15.7-14.7)
=0.86*1
=0.86
0.325*0.8+1.1*0.325-0.325*0.9
=0.325*(0.8+1.1-0.9)
=0.325*1
=0.325
3.6-3.6*0.5
=3.6*1-3.6*0.5
=3.6*(1-0.5)
=3.6*0.5
=1.8
2.3*99+2.3
=2.3*99+2.3*1
=2.3*(99+1)
=2.3*100
=230
0.87*9.9+1.1*0.87-0.87
=0.87*(9.9+1.1-1)
=0.87*10
=8.7
4.32-4.32*0.9
=4.32*1-4.32*0.9
=4.32*(1-0.9)
=4.32*0.1
=0.432
0.87*101
=0.87*(100+1)
=0.87*100+0.87*1
=87+0.87
=87.87
0.23*9.9
=0.23*(10-0.1)
=0.23*10-0.23*0.1
=2.3-0.023
=2.277
56*10.1
=56*(10+0.1)
=56*10+56*0.1
=560+5.6
=565.6
8.5*98
=8.5*(100-2)
=8.5*100-8.5*2
=850-17
=833
0.36*3400+36*66
=0.36*3400+0.36*6600
=0.36*(3400+6600)
=0.36*10000
=3600
32.5*1130-325*13
=32.5*1130-32.5*130
=32.5*(1130-130)
=32.5*1000
=32500
以上題目考察簡便運算的知識點包括:
乘法交換率、乘法分配率、乘法分配率的逆運算、添加因數“1”、拆分法和小數點移動法。
解答完畢!