1。 0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14 2. -36×-4/9+5/6-7/12 3. 99 7/8×-13 4. -17×-3 1/17
1。0.7×194/9+23/4×-14+0.7×5/9+1/4×-142.-36×-4/9+5/6-7/123.997/8×-134.-17×-31/17...
1。 0.7×19 4/9+2 3/4×-14+0.7×5/9+1/4×-14
2. -36×-4/9+5/6-7/12
3. 99 7/8×-13
4. -17×-3 1/17 展开
2. -36×-4/9+5/6-7/12
3. 99 7/8×-13
4. -17×-3 1/17 展开
1个回答
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0.7×19又4/9+2又3/4×-14+0.7×5/9+1/4×-14
=(0.7×19又4/9+0.7×5/9)-(2又3/4×14+1/4×14)
=0.7×(19又4/9+5/9)-14×(2又3/4+1/4)
=0.7×20-14×3
=14-14×3
=14×(1-3)
=14×(-2)
=-28
-36×-4/9+5/6-7/12
=-4×(-4)+(10/12-7/12)
=16+5/12
=16又5/12
99又7/8×-13
=(100-1/8)×(-13)
=100×(-13)-1/8×(-13)
=-1300+13/8
=-1298又3/8
-17×3又1/17
=-17×52/17
=-52
=(0.7×19又4/9+0.7×5/9)-(2又3/4×14+1/4×14)
=0.7×(19又4/9+5/9)-14×(2又3/4+1/4)
=0.7×20-14×3
=14-14×3
=14×(1-3)
=14×(-2)
=-28
-36×-4/9+5/6-7/12
=-4×(-4)+(10/12-7/12)
=16+5/12
=16又5/12
99又7/8×-13
=(100-1/8)×(-13)
=100×(-13)-1/8×(-13)
=-1300+13/8
=-1298又3/8
-17×3又1/17
=-17×52/17
=-52
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