23.1×160-46.2×70简便运算
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23.1×160-46.2×70简便运算23.1×160-46.2×70简便运算23.1×160-46.2×70简便运算23.1X160-23.1X140=23.1X[160-140]=23.1X20
23.1×160-46.2×70简便运算
23.1×160-46.2×70简便运算
23.1×160-46.2×70简便运算
23.1X160-23.1X140
=23.1X[160-140]
=23.1X20
=462
=23.1×2×80-46.2×70
=46.2×80-46.2×70
=46.2×（80-70）
=46.2×10
=462
23.1×160-46.2×70
=23.1×160-23.1×(2×70)
=23.1×160-23.1×140
=23.1×(160-140)
=23.1×20
=462