计算(1)-20+(-14)-(-18)-13(2) 1- 4 7 + 1 5 - 3 7 + 9 5
计算(1)-20+(-14)-(-18)-13(2)1-47+15-37+95(3)289×(-36)(用简便方法计算)(4))10+(-2)2×(-5)(5)(-25)...
计算(1)-20+(-14)-(-18)-13(2) 1- 4 7 + 1 5 - 3 7 + 9 5 (3) 2 8 9 ×(-36) (用简便方法计算)(4))10+(-2) 2 ×(-5)(5) (-25)÷ 5 4 × 4 5 ÷(-16) (6)(-24)×( 1 6 - 1 4 + 1 2 )
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(1)-20+(-14)-(-18)-13 =-20-14+18-13 =-29; (2) 1-
=1-(
=1-1+2 =2; (3) 2
=(3-
=3×(-36)-
=-108+4 =-104; (4))10+(-2) 2 ×(-5) =10+4×(-5) =10-20 =-10; (5) (-25)÷
=25×
=1; (6)(-24)×(
=-24×
=-4+6-12 =-10. |
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