问题
解答题
计算. (1)9
(2)[22.5+(3
(3)
(4)
|
答案
(1)9
×4.25+45 6
×1 4
,1 6
=(9
+5 6
)×4.25,1 6
=10×4.25,
=42.5;
(2)[22.5+(3
+1.8-1.21×3 5
)]÷40%,5 11
=[22.5+(3.6+1.8-0.55)]÷40%,
=[22.5+(5.4-0.55)]÷40%,
=[22.5+4.85]÷0.4,
=27.35÷0.4,
=68.375;
(3)
×3 10
+3 8
×1 15
+7 16
×31 5
,1 2
=
+9 80
+7 240
,7 10
=
+34 240
,168 240
=
;101 120
(4)
,
×7 18
+9 2 1 6 13
-1 3
×15 4 16 5
=
,
+7 4 1 6 13
-121 3
=
,23 12 4 3
=
×23 12
,3 4
=
.23 16