Question

初一数学题，求解答

Answer 1

27.
∵
∣a-2∣和∣b+2∣互为相反数.
∴
∣a-2∣+∣b+2∣=0
a-2=0 b+2=0
a=2 b=-2
∴
a+b=2-2=0

28.
根据题意，得：
a+b=0 cd=1 ∣m∣=2
∴
(a+b)/+3+cd+∣m∣
=0/3+1+2
=3

29.
∣1/101-1/102∣+∣1/102-1/103∣+∣1/103-1/104∣+.....+∣1/109-1/110∣
=1/101-1/102+1/102-1/103+1/103-1/104+....+1/108-1/109+1/109-1/郑兆激喊袜110
=1/101-1/110
=9/1110

30.(1)
原式=
=4x(-37/5)+4x5+4x12/5
=4x(-37/5+5+12/猜罩5)
=4x(-5+5)
=4x0
=0

(2) 原式=
=19/6x(22/7-22/3)x6/19÷22/21
=22x(1/7-1/3)x21/22
=1/7x21-1/3x21
=3-7
=-4