问题
解答题
简便计算．
9.7×1.25×0.8． |
答案
①
×2 3
+4 15
×2 3 11 15
=
×(2 3
+4 15
)11 15
=
×12 3
=
；2 3
②
×7 4
+5 8
÷1 4 8 5
=(
+7 4
)×1 4 5 8
=2×5 8
=
；5 4
③9.7×1.25×0.8
=9.7×（1.25×0.8）
=9.7×1
=9.7．
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