Đáp án:
Giải thích các bước giải:
a) `17×(1313/5151+1111/3434):\frac{177}{12}`
`=17×(\frac{13×101}{51×101}+\frac{11×101}{34×101}):\frac{177}{12}`
`=17×(13/51+11/34)×\frac{12}{177}`
`=(17×13/51+17×11/34)×\frac{12}{177}`
`=(13/3+11/2)×\frac{12}{177}`
`=13/3×\frac{12}{177}+11/2×\frac{12}{177}`
`=52/177+66/177`
`=2/3`
b) `3×(1/7+1/3-3/14):11/14`
`=3×(6/42+14/42-9/42):11/14`
`=3×11/42:11/14`
`=3×11/42. 14/11`
`=3×1/3`
`=1`
c) `1/2×2/5+1/2×3/5-1/2`
`=1/2×(2/5+3/5-1)`
`=1/2×(1-1)`
`=1/2×0=0`
