?11??1.5?1.4?4.3?5.2?3.6 ??6?????
????0.5?11??1?3?6?????24??
?3?????5????1?0.2?3??5?????2???
?34??????2?2????1?2??1?? ??4?2??
?112???11??0.3?33?3?????2?
?32??2.5?7.3?2.5?(?2.4)?2.5?(?1.7)?|?5|????12???5??1???2?3?1????????3??
-9+5×(-6) -(-4)2÷(-8) 4?6x?2x?12?3
x?12?3x)―15―(―0.25) ??1 15+(―1423
941111(?81)???(?32) —48 × (???)
49436612
3?5????4?2???????? (2m+2)×4m ?2
?4?8??
(2x+y)-(2x-y)
2
2
(
143222
xy)·(-12xy)÷(-xy) 33
[(3x+2y)(3x-2y)-(x+2y)(3x-2y)]÷3x
先化简后求值:m(m-3)-(m+3)(m-3),其中m=-4.
143232 2
4×(-3)-13+(- )-|-4| -3-[(-2)-(1-×)÷(-2)]
254
2x-19=7x+31
化简(求值)2(xy?xy)?2(xy?x)?2xy?2y的值,其中x??2,y?2
22223x?15x?7- = 1 461?21?16?(?)2?4?(?3) 5x2?6?3x3?x3?2x2?3
2
????先化简,再求值,已知a = 1,b = —的值
1?212?3323,求多项式?a?2b??2?ab?ab??2?ab?b?23??-2-(-3)×(-1)-(-1) -1-(1-0.5)×
234512×[2-(-3)] 332211+(-22)-3×(-11) (2)(?3)2?()2??6??293
3