题目内容

【题目】口算.

800﹣250= 30×40= 8100÷900= 10﹣0.98= 105÷7= 560+770=

0.25×0.4= 6.3÷0.07= 0.64÷8= 8.85×10= 4.73+0.7= =

= = = 3.6×= 8×1.36×1.25= 7.2×2.8+2.8×0.8=

【答案】550,1200,9,9.02,15,1330,0.1,90,0.08,88.5,5.43,,0.9,13.6,22.4.

【解析】

试题分析:8×1.36×1.25运用乘法交换律简算;

7.2×2.8+2.8×0.8运用乘法分配律简算;

其它题目根据运算法则直接求解.

解:

800﹣250=550, 30×40=1200, 8100÷900=9, 10﹣0.98=9.02, 105÷7=15, 560+770=1330,

0.25×0.4=0.1, 6.3÷0.07=90, 0.64÷8=0.08, 8.85×10=88.5, 4.73+0.7=5.43, =

= ==, 3.6×=0.9, 8×1.36×1.25=13.6, 7.2×2.8+2.8×0.8=22.4.

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