题目内容
【题目】
口算.
= = = 2.25+=
= 2.5×0.1= 7.5÷0.5= =
20.1+9.09= ×= ﹣= 1÷0.1﹣1×0.1=
(+)×63= 0.5÷= 0.4÷40%= 0.42﹣0.32=
【答案】,,,4,16,0.25,15,20,29.19,,,9.9,16,2,1,0.07.
【解析】
试题分析:20.1+9.09注意小数的位数;1÷0.1﹣1×0.1先同时运算乘法和除法,最后算减法;(+)×63运用乘法分配律简算;0.42﹣0.32=0.4×0.4﹣0.3×0.3,由此求解;
其它题目根据运算法则直接求解.
解:
=, =, =, 2.25+=4,
=16, 2.5×0.1=0.25, 7.5÷0.5=15, =20,
20.1+9.09=29.19, ×=, ﹣=, 1÷0.1﹣1×0.1=9.9,
(+)×63=16, 0.5÷=2, 0.4÷40%=1, 0.42﹣0.32=0.07.
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