问题
解答题
用简便方法计算.(写出简算过程)
|
答案
(1)
+5 12
+3 8
+7 12
,5 8
=(
+5 12
)+(7 12
+3 8
),5 8
=1+1,
=2;
(2)70.2×0.08+9.2×7.02,
=7.02×0.8+9.2×7.02,
=7.02×(0.8+9.2),
=7.02×10,
=70.2.
用简便方法计算.(写出简算过程)
|
(1)
+5 12
+3 8
+7 12
,5 8
=(
+5 12
)+(7 12
+3 8
),5 8
=1+1,
=2;
(2)70.2×0.08+9.2×7.02,
=7.02×0.8+9.2×7.02,
=7.02×(0.8+9.2),
=7.02×10,
=70.2.