几道数学题,谢谢
1.(7/9-5/6+3/18)×18-1.45×6+3.95×62./2+7/6-13/12)×(-12)3.5-3×1/2×2-|-2|×(-2)4.(1/6-3/1...
1.(7/9-5/6+3/18)×18-1.45×6+3.95×6
2./2+7/6-13/12)×(-12)
3.5-3×1/2×2-|-2|×(-2)
4.(1/6-3/14+2/3-2/7)×(-42)
5.-49+2×9+(-6)×(-9)
第二道题是3/2+7/6-13/12)×(-12) 展开
2./2+7/6-13/12)×(-12)
3.5-3×1/2×2-|-2|×(-2)
4.(1/6-3/14+2/3-2/7)×(-42)
5.-49+2×9+(-6)×(-9)
第二道题是3/2+7/6-13/12)×(-12) 展开
展开全部
1、(7/9 - 5/6 + 3/18)× 18 - 1.45 × 6 + 3.95 × 6
= (7/9 - 5/6 + 1/6)× 18 + (-1.45 + 3.95)× 6
= (7/9 - 4/6)× 18 + 2.5 × 6
= (7/9 - 2/3)× 18 + 5/2 × 6
= (7/9 - 6/9)× 18 + 5/2 × 6
= 1/9× 18 + 15
= 2 + 15
= 17
2、(3/2+7/6-13/12)×(-12)
= 3/2 ×(-12)+ 7/6×(-12)- 13/12×(-12)
= -18 -14 + 13
= -19
3、5 - 3 × 1/2 × 2 - |-2| ×(-2)
= 5 - 3 - 2×(-2)
= 2 + 4
= 6
4、(1/6 - 3/14 + 2/3 - 2/7)×(-42)
= 1/6 ×(-42) - 3/14 ×(-42) + 2/3 ×(-42) - 2/7 ×(-42)
= -7 + 9 - 28 + 12
= -14
5、-49 + 2 × 9 +(-6)×(-9)
= -49 + 18 + 54
= 23
= (7/9 - 5/6 + 1/6)× 18 + (-1.45 + 3.95)× 6
= (7/9 - 4/6)× 18 + 2.5 × 6
= (7/9 - 2/3)× 18 + 5/2 × 6
= (7/9 - 6/9)× 18 + 5/2 × 6
= 1/9× 18 + 15
= 2 + 15
= 17
2、(3/2+7/6-13/12)×(-12)
= 3/2 ×(-12)+ 7/6×(-12)- 13/12×(-12)
= -18 -14 + 13
= -19
3、5 - 3 × 1/2 × 2 - |-2| ×(-2)
= 5 - 3 - 2×(-2)
= 2 + 4
= 6
4、(1/6 - 3/14 + 2/3 - 2/7)×(-42)
= 1/6 ×(-42) - 3/14 ×(-42) + 2/3 ×(-42) - 2/7 ×(-42)
= -7 + 9 - 28 + 12
= -14
5、-49 + 2 × 9 +(-6)×(-9)
= -49 + 18 + 54
= 23
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