问题
解答题
简便计算.
|
答案
(1)
+5 8
+1 3
+3 8
+8,2 3
=(
+5 8
)+(3 8
+1 3
)+8,2 3
=1+1+8,
=10;
(2)4×0.8×2.5×1.25,
=(4×2.5)×(0.8×1.25),
=10×1,
=10;
(3)117×12+83×12,
=(117+83)×12,
=200×12,
=2400.
简便计算.
|
(1)
+5 8
+1 3
+3 8
+8,2 3
=(
+5 8
)+(3 8
+1 3
)+8,2 3
=1+1+8,
=10;
(2)4×0.8×2.5×1.25,
=(4×2.5)×(0.8×1.25),
=10×1,
=10;
(3)117×12+83×12,
=(117+83)×12,
=200×12,
=2400.