(1)79.76+84.7×0.2 | (2)15.37+28.44+12.56 |
(3)(2.3×8.8-2.3×0.8)×1.25 | (4)[5.2-(2.5+7.5÷5)]×1.2. |
烟oo头 幼苗
共回答了18个问题采纳率:94.4% 举报
(1)79.76+84.7×0.2,
=79.76+16.94,
=96.7;
(2)15.37+28.44+12.56,
=15.37+(28.44+12.56),
=15.37+41,
=56.37;
(3)(2.3×8.8-2.3×0.8)×1.25,
=2.3×(8.8-0.8)×1.25,
=2.3×8×1.25,
=2.3×(8×1.25),
=2.3×10,
=23;
(4)[5.2-(2.5+7.5÷5)]×1.2,
=[5.2-(2.5+1.5)]×1.2,
=[5.2-4]×1.2,
=1.2×1.2,
=1.44.
点评:
本题考点: 小数四则混合运算;运算定律与简便运算.
考点点评: 四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
1年前
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