题目内容
计算:(能简算的要简算)
×[
-(
-
)]
1.21×42-(4.46+0.14)
(
-
+
)×12
(
+
)÷
1.21×42-(4.46+0.14)
(
(
解:(1)
×[
-(
-
)],
=
×[
-
],
=
×
,
=
;
(2)1.21×42-(4.46+0.14),
=1.21×42-4.6,
=50.82-4.6,
=46.22;
(3)(
-
+
)×12,
=
×12-
×12+
×12,
=4-2+3,
=5;
(4)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=
+1,
=2
=
=
=
(2)1.21×42-(4.46+0.14),
=1.21×42-4.6,
=50.82-4.6,
=46.22;
(3)(
=
=4-2+3,
=5;
(4)(
=(
=
=
=2
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