分析:(1)先算除法,再算加法;
(2)先算括號(hào)里面的,再算乘除;
(3)(4)(5))按照有理數(shù)混合運(yùn)算的順序,先乘方后乘除最后算加減,有括號(hào)的先算括號(hào)里面的;
(6)先算括號(hào)里面的,再約分化簡(jiǎn)即可.
解答:解:(1)-72+72÷36
=-72+2
=-70;
(2)
3×(-)×÷=
×(-
)×
×
=
;
(3)(-1)
3-(1-
)÷3×[2-(-3)
2]
=-1-
×
×[2-9]
=-1-
×[-7]
=-1+
=
;
(4)-9
2+2×(-3)
2-(-6)
÷(-)=-81+2×9-4.5
=-81+18-4.5
=-67.5;
(5)
-2×(-)2+|-(-2)|3-(-)=-2×
+8+
=-
+8+
=8;
(6)
(-1)×(-1)×(-1)×…×(-1)×(-1)×(-1)=-
×
×…×
×
=-
.
點(diǎn)評(píng):本題考查的是有理數(shù)的運(yùn)算能力.注意:
(1)要正確掌握運(yùn)算順序,在混合運(yùn)算中要特別注意運(yùn)算順序:先三級(jí),后二級(jí),再一級(jí);有括號(hào)的先算括號(hào)里面的;同級(jí)運(yùn)算按從左到右的順序;
(2)去括號(hào)法則:--得+,-+得-,++得+,+-得-.
(3)整式中如果有多重括號(hào)應(yīng)按照先去小括號(hào),再去中括號(hào),最后大括號(hào)的順序進(jìn)行.