问题
解答题
用简便方法计算: 907×99+907 1.2×16+8.4×12
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答案
①907×99+907,
=907×(99+1),
=907×100,
=90700;
②1.2×16+8.4×12,
=1.2×16+84×1.2,
=1.2×(16+84),
=120;
③
÷18 23
+8 5
×18 23
,3 8
=
×18 23
+5 8
×18 23
,3 8
=
×(18 23
+5 8
),3 8
=
×1,18 23
=
.18 23