问题
解答题
用递等式计算(能简算的要用简便方法计算). 4.32+3.2+5.68 79×101-79 132+25×8 20-
(0.125×8-0.5)×4 (0.25+
|
答案
(1)4.32+3.2+5.68
=4.32+5.68+3.2,
=10+3.2,
=13.2;
(2)79×101-79
=(101-1)×79,
=100×79,
=7900;
(3)132+25×8
=132+200,
=332;
(4)20-
×5 3 25
=20-
,3 5
=19
;2 5
(5)(0.125×8-0.5)×4
=(1-0.5)×4,
=0.5×4,
=2;
(6)(0.25+
)÷(5 8
-7 4
)7 8
=(
+2 8
)÷(5 8
-14 8
),7 8
=
÷7 8
,7 8
=1.