Bài 1:
a) `58 × 75 + 58 × 50 - 58 × 25`
`= 58 × ( 75 + 50 - 25 )`
`= 58 × 100`
`= 5800`
b) `27 × 39 + 27 × 63 - 2 × 27`
`= 27 × ( 39 + 63 - 2 )`
`= 27 × 100`
`= 2700`
c) `128 × 46 + 128 × 32 + 128 × 22`
`= 128 × ( 46 + 32 + 22 )`
`= 128 × 100`
`= 12800`
e) `12 × 35 + 35 × 182 - 35 × 94`
`= 35 × ( 12 + 182 - 94 )`
`= 35 × 100`
`= 3500`
f) `35 × 23 + 35 × 41 + 64 × 65`
`= 35 × ( 23 + 41 ) + 64 × 65`
`= 35 × 64 + 64 × 65`
`= 64 × ( 35 + 65 )`
`= 64 × 100`
`= 6400`
g) `29 × 87 - 29 × 23 + 64 × 71`
`= 29 × ( 87 - 23 ) + 64 × 71`
`= 29 × 64 + 64 × 71`
`= 64 × ( 29 + 71 )`
`= 64 × 100`
`= 6400`
@ Rin gửi
