1.8×0.9+0.18 | 5.4×0.68+3.4×2×0.46 |
23.9-0.6×0.6-0.64 | 6.82÷4÷0.25 |
1.26÷(1.26×0.8) | 0.7777×0.7+0.1111×2.1. |
9421 幼苗
共回答了16个问题采纳率:87.5% 举报
(1)1.8×0.9+0.18
=1.8×0.9+1.8×0.1
=1.8×(0.9+0.1)
=1.8×1
=1.8;
(2)5.4×0.68+3.4×2×0.46
=5.4×0.68+6.8×0.46
=5.4×0.68+0.68×4.6
=(5.4+4.6)×0.68
=10×0.68
=6.8;
(3)23.9-0.6×0.6-0.64
=23.9-0.36-0.64
=23.9-(0.36+0.64)
=23.9-1
=22.9;
(4)6.82÷4÷0.25
=6.82÷(4×0.25)
=6.82÷1
=6.82;
(5)1.26÷(1.26×0.8)
=1.26÷1.26÷0.8
=1÷0.8
=1.25;
(6)0.7777×0.7+0.1111×2.1
=0.1111×7×0.7+0.1111×2.1
=0.1111×4.9+0.1111×2.1
=0.1111×(4.9+2.1)
=0.1111×7
=0.7777.
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: 考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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