1. 用计算器计算 $0.90 + 6.50$ 时,在计算器上先按(
0.9
),再按(+
),再按(6.5
),最后按(=
),得数为(7.4
)。用计算器计算 $10 - 7.40$ 时,在计算器上先按(10
),再按(-
),再按(7.4
),最后按(=
),得数为(2.6
)。答案
1. 0.9 + 6.5 = 7.4 10 - 7.4 = 2.6
2. 用计算器计算 $50.20 - 0.65$ 时,有(
1
)个 $0$ 可以不用按。答案
2. 1
二、先用竖式计算,再用计算器验算。
$9.08 - 5.86 =$ $0.57 + 2.84 =$ $3.9 - 0.39 =$
$60.5 - 45 =$ $60 - 15.65 =$ $3.4 + 27.06 =$
$9.08 - 5.86 =$ $0.57 + 2.84 =$ $3.9 - 0.39 =$
$60.5 - 45 =$ $60 - 15.65 =$ $3.4 + 27.06 =$
答案
二、3.22 3.41 3.51 15.5 44.35 30.46
三、用计算器计算。
$3.78 + 0.48 =$ $0.95 - 0.61 + 0.05 =$
$3 + 0.3 =$ $9.26 + 7.26 - 3.15 =$
$84.26 - 0.96 =$ $600.31 + 38.67 + 11.23 =$
$3.78 + 0.48 =$ $0.95 - 0.61 + 0.05 =$
$3 + 0.3 =$ $9.26 + 7.26 - 3.15 =$
$84.26 - 0.96 =$ $600.31 + 38.67 + 11.23 =$
答案
$3.78 + 0.48 = 4.26$;
$0.95 - 0.61 + 0.05 =0.39+ 0.05= 0.44$;
$3 + 0.3 = 3.3$;
$9.26 + 7.26 - 3.15 =16.52-3.15 = 13.37$;
$84.26 - 0.96 = 83.3$;
$600.31 + 38.67 + 11.23 =638.98+ 11.23 = 650.21$。
$0.95 - 0.61 + 0.05 =0.39+ 0.05= 0.44$;
$3 + 0.3 = 3.3$;
$9.26 + 7.26 - 3.15 =16.52-3.15 = 13.37$;
$84.26 - 0.96 = 83.3$;
$600.31 + 38.67 + 11.23 =638.98+ 11.23 = 650.21$。
四、兰兰在用计算器计算 $9.62$ 加一个一位小数时,忘记按小数点键了,把这个一位小数当成整数来计算,结果得到了 $85.62$。正确的得数应该是多少?
答案
四、85.62 - 9.62 = 76 9.62 + 7.6 = 17.22
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