问题
解答题
100.4-9+0.77÷1.1 简算:(
解方程
|
答案
(1)100.4-9+0.77÷1.1,
=100.4-9+0.7,
=91.4+0.7,
=92.1;
(2)(
+4 17
)×17×25,1 25
=(
+4 17
)×(17×25),1 25
=(
×17×25)+(4 17
×25×17),1 25
=(4×25)+(1×17),
=100+17,
=117;
(3)
x-1 2
=3 8
,13 8
x-1 2
+3 8
=3 8
+13 8
,3 8
x=2,1 2
x÷1 2
=2÷1 2
,1 2
x=4.