题目内容
能简要简 13.5×7.6+3.8 | 102×8.5 | 15.7×0.46-5.7×0.46 |
62.1÷4.6-0.6 | 0.25×7.3×0.4 | 7.35÷0.125÷8 |
考点:小数四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:①先算乘法,再算加法即可;
②利用乘法分配律即可;
③利用乘法分配律即可;
④先算除法,再算减法即可;
⑤利用乘法交换律即可;
⑥利用a÷b÷c=a÷(b×c)即可.
②利用乘法分配律即可;
③利用乘法分配律即可;
④先算除法,再算减法即可;
⑤利用乘法交换律即可;
⑥利用a÷b÷c=a÷(b×c)即可.
解答:
解:①13.5×7.6+3.8
=102.6+3.8
=106.4
②102×8.5
=(100+2)×8.5
=100×8.5+2×8.5
=850+17
=867
③15.7×0.46-5.7×0.46
=0.46×(15.7-5.7)
=0.46×10
=4.6
④62.1÷4.6-0.6
=13.5-0.6
=12.9
⑤0.25×7.3×0.4
=0.25×0.4×7.3
=0.1×7.3
=0.73
⑥7.35÷0.125÷8
=7.36÷(0.125×8)
=7.36÷1
=7.36
=102.6+3.8
=106.4
②102×8.5
=(100+2)×8.5
=100×8.5+2×8.5
=850+17
=867
③15.7×0.46-5.7×0.46
=0.46×(15.7-5.7)
=0.46×10
=4.6
④62.1÷4.6-0.6
=13.5-0.6
=12.9
⑤0.25×7.3×0.4
=0.25×0.4×7.3
=0.1×7.3
=0.73
⑥7.35÷0.125÷8
=7.36÷(0.125×8)
=7.36÷1
=7.36
点评:完成本题,要注意根据题中数字选择合适的简便方法.
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