急递等式简便计算 四年下册 18*12+18*88 37*29+37+37*70 25*32*125 16*98+32

18*12+18*88 =18*(88+12)=18*100=1800 37*29+37+37*70 =37*(29+1+70)=3700
25*32*125 =(25*4)*(8*125)=100*1000=100000 16*98+32=16*100=1600

18*12+18*88
=18*(12+88)
=18*100
=1800
37*29+37+37*70
=37*(29+1+70)
=37*100
=3700
25*32*125
=25*(4*8)*125
=(25*4)*(8*125)
=100*1000
=100000
16*98+32
=16*98+16*2
=16*(98+2)
=16*100
=1600

18*12+18*88
=18*(12+88)
=18*100
=1800
37*29+37+37*70
=37*(29+1+70)
=37*1000
=3700
25*32*125
=(25*4)*(8*125)
=100*1000
=100000
16*98+32
=16*(98+2)
=16*100
=1600