21.27-3.9+0.73-16.1 | (45.9-32.7)÷8÷0.125 |
16.8×10.1 | 6.73×5.8+0.42×67.3 |
68.4×99 | 32×0.25×1.25. |
林天飞翔 花朵
共回答了30个问题采纳率:86.7% 举报
(1)21.27-3.9+0.73-16.1
=(21.27+0.73)-(3.9+16.1)
=22-20
=2;
(2)(45.9-32.7)÷8÷0.125
=13.2÷(8×0.125)
=13.2÷1
=13.2;
(3)16.8×10.1
=16.8×(10+0.1)
=168+1.68
=169.68;
(4)6.73×5.8+0.42×67.3
=67.3×0.58+0.42×67.3
=67.3×(0.58+0.42)
=67.3×1
=67.3;
(5)68.4×99
=68.4×(100-1)
=6840-68.4
=6771.6;
(6)32×0.25×1.25
=4×8×0.25×1.25
=(4×0.25)×(8×1.25)
=1×10
=10.
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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