Giải thích các bước giải:
a) 58. 75 + 58. 50 – 58. 25
=4350+58×50−58×25
=4350+2900−58×25
=4350+2900−1450
=7250−1450
=5800
b) 27. 39 + 27. 63 – 2. 27
=1053+27×63−2×27
=1053+1701−2×27
=1053+1701−54
=2754−54
=2700
c) 128. 46 + 128. 32 + 128. 22
=5888+128×32+128×22
=5888+4096+128×22
=5888+4096+2816
=9984+2816
=12800
d) 66. 25 + 5. 66 + 66. 14 + 33. 66
=1650+5×66+66×14+33×66
=1650+330+66×14+33×66
=1650+330+924+33×66
=1650+330+924+2178
=1980+924+2178
=2904+2178
=5082
e) 12. 35 + 35. 182 – 35. 94
=420+35×182−35×94
=420+6370−35×94
=420+6370−3290
=6790−3290
=3500
xin hay nhất! :)))