9x8x125x4简便计算
简便计算 -
8x9x125 =8x125x9 =1000x9 =9000 你应该背过4x25=100,8x125=1000.望采纳!!!
解:原式=9x8x4x4x25x125 =(125x8)x(25x4)x(9x4)=1000x100x36 =100000x36 =3600000 方法:拆分后利用乘法结合律实现简便计算。
8x9x125 =8x125x9 =1000x9 =9000 你应该背过4x25=100,8x125=1000.望采纳!!!
解:原式=9x8x4x4x25x125 =(125x8)x(25x4)x(9x4)=1000x100x36 =100000x36 =3600000 方法:拆分后利用乘法结合律实现简便计算。
72x125=9x8x125=(8x125)9x1000=9000 25x23-19x25=25x(23-19)25x4=100 32x(100-3)32x100-32x3=3200-96=3104 554-178+222=554+222-178=776-178=776-176-2=600-2=598 840÷6÷70=840÷(6x70)840÷420=2
不给分没关系,重要的是你能掌握解题方法,25 x(4+8)=25x4+25x8 =100+200 =300 12x25=3x4x25 =3x100 =300 72x125=9x8x125 =9x1000 =9000 88x125=11x8x125 =11x1000 =11000 17x23-23x7=(17-7)x23 =10x23 =230 46x99=46x(100-1)=46x100-46x1 =4600-46 =4554 46x102=好了吧!
简便计算 72x125 64x99+64 8.29+3.7+0.71+6.3 4900÷25÷4 -
=9x8x125 =9x(8x125)=9x1000 =9000 64x99+64 =64x(99+1)=64x100 =6400 8.29+3.7+0.71+6.3 =(8.29+0.71)+(3.7+6.3)=9+10 =19 4900÷25÷4 =4900÷(25x4)=4900÷100 =49 17×43-43×7 =43×(17-7)=43×10 =430 54.3-12.19+25.7-17.81 =(54.3+25.7)后面会介绍。
原式=9x125x(4x25)=9x125x100 =(8+1)x125x100 =8x125x100+1x125x100 =1000x100+125x100 =100000+12500 =112500
用简便方法计算 678+591+409= 125×64×25= 25×25×16= 72×125=?
678+591+409=678+1000=1678 125*64*25=125*4*4*4*25=500*4*100=200000 25*25*16=25*4*25*4=10000 72*125=8*9*125=9*1000=9000
八乘以括号36×125括起来。如果遇见便方法计算的话,先去掉括号。然后运8×125=1000。这月1000×36=36000,这个过程用了乘法的交换律以及结合律。
四年级下册简便运算题目 -
17-7)=23x10=230.4. 35x127-35x16-11x35=35x(127-16-11)=35x100 =3500.5. 125x32x8=(125x8)x32 =1000x32 =32000.6. 25x32x125=(25x4)x(8x125)=100x1000 =100000.7. 88x125=8x125+80x125 =1000+10000 =11000.8. 72x125=9x(8x125)=9x1000 =9000还有呢?.
利用125x8=1000,25x4=100来计算原式=6x(8x125)x9x87x(125x8)x(4x25)=6x9x87x1000x1000x100 =467800000000