解:(1)24÷(
-
+
),
=24÷(
+
),
=24÷
,
=
;
(2)
×99﹢0.79,
=0.79×99﹢0.79×1,
=0.79×(99+1),
=0.79×100,
=79;
(3)(1-
×
)÷(
﹢
),
=(1-
)÷(
﹢
),
=
÷
,
=
;
(4)99×101,
=99×(100+1),
=99×100+99×1,
=9900+99,
=9999;
(5)
×[
-(
-
)],
=
×[
-
+
],
=
×[
+
-
],
=
×(1-
),
=
×
,
=
;
(6)(
-
)÷
,
=(
-
)×30,
=
×30-
×30,
=20-6,
=14.
分析:(1)先算小括號(hào)里面的加法,再算小括號(hào)里面的加法,最后算式括號(hào)外的除法;
(2)(6)運(yùn)用乘法分配律簡算;
(3)先算第一個(gè)小括號(hào)里面的乘法,再同時(shí)運(yùn)算兩個(gè)小括號(hào)里面的減法和加法,最后算括號(hào)外的除法;
(4)先把101分解成100+1,再運(yùn)用乘法分配律簡算;
(5)先把中括號(hào)里面的計(jì)算運(yùn)用減法的性質(zhì)簡算,再算括號(hào)外的乘法.
點(diǎn)評(píng):本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡便計(jì)算.