题目内容
脱式计算.
90-78.09+4.23; 32.34÷2.1×0.45; 15.32-1.8×5-3.46.
90-78.09+4.23; 32.34÷2.1×0.45; 15.32-1.8×5-3.46.
分析:(1)(2)按照从左到右的顺序计算;
(3)先算乘法,再按照从左到右的顺序计算计算减法.
(3)先算乘法,再按照从左到右的顺序计算计算减法.
解答:解:(1)90-78.09+4.23
=11.91+4.23
=16.14;
(2)32.34÷2.l×0.45
=15.4×0.45
=6.93;
(3)15.32-1.8×5-3.46
=15.32-9-3.46
=6.32-3.46
=2.86.
=11.91+4.23
=16.14;
(2)32.34÷2.l×0.45
=15.4×0.45
=6.93;
(3)15.32-1.8×5-3.46
=15.32-9-3.46
=6.32-3.46
=2.86.
点评:本题考查了简单的四则混合运算,关键是理清楚运算的顺序,然后根据运算顺序逐步求解即可.
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