× + ×![]() | × ×16 | 49×![]() |
×12+![]() | ( + )×12×35 | ( + + )×48. |
×
+
×
,=(
)×
,=1×
,=
;(2)
×
×16,=
×16×
,=10×
,=2
;(3)49×
,=48×
+1×
,=11+
,=11
;(4)
×12+
,=12×(
),=12×1,
=12;
(5)(
+
)×12×35,=
×12×35+
×12×35,=9×35+12×7,
=315+84,
=499;
(6)(
+
+
)×48,=
×48+
×48+
×48,=42+8+32,
=82.
分析:(1)(3)(4)(5)(6)运用乘法分配律解答,
(2)运用乘法交换律解答.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.