题目内容
递等式计算.
3.97+0.7-1.32 | 65+32×4 | 75.6-(14.3-8.3) |
(47+33)÷13 | 15×27-200÷8 | (324-285)×12÷26. |
解:
(1)3.97+0.7-1.32,
=4.67-1.32,
=3.35;
(2)65+32×4,
=65+128,
=193;
(3)75.6-(14.3-8.3),
=75.6-6,
=69.6;
(4)(47+33)÷13,
=80÷13,
=;
(5)15×27-200÷8,
=405-25,
=380;
(6)(324-285)×12÷26,
=39×12÷26,
=468÷26,
=18.
分析:(1)先算加法,再算减法;
(2)先算乘法,再算加法;
(3)先算小括号里面的减法;再算括号外面的减法;
(4)先算加法,再算除法;
(5)先算乘法和除法,再算减法;
(6)先算减法,再算乘法,最后算除法.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
(1)3.97+0.7-1.32,
=4.67-1.32,
=3.35;
(2)65+32×4,
=65+128,
=193;
(3)75.6-(14.3-8.3),
=75.6-6,
=69.6;
(4)(47+33)÷13,
=80÷13,
=;
(5)15×27-200÷8,
=405-25,
=380;
(6)(324-285)×12÷26,
=39×12÷26,
=468÷26,
=18.
分析:(1)先算加法,再算减法;
(2)先算乘法,再算加法;
(3)先算小括号里面的减法;再算括号外面的减法;
(4)先算加法,再算除法;
(5)先算乘法和除法,再算减法;
(6)先算减法,再算乘法,最后算除法.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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