递等式:13+(-15)+37+(-28) 3+(-1)+(-3)+1+(-4)(-3/4)+(-2/3)+(-1/4)+2/3 0.35+(-0.6)+0.25+(-5.4)运用加法运算律简化计算:例1:计算(1)(-2)+3+1+(-3)+2 (2)(-2.7)+(-4.5)+(+1
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 12:44:22
![递等式:13+(-15)+37+(-28) 3+(-1)+(-3)+1+(-4)(-3/4)+(-2/3)+(-1/4)+2/3 0.35+(-0.6)+0.25+(-5.4)运用加法运算律简化计算:例1:计算(1)(-2)+3+1+(-3)+2 (2)(-2.7)+(-4.5)+(+1](/uploads/image/z/6953046-6-6.jpg?t=%E9%80%92%E7%AD%89%E5%BC%8F%EF%BC%9A13%2B%EF%BC%88-15%EF%BC%89%2B37%2B%EF%BC%88-28%EF%BC%89+3%2B%EF%BC%88-1%EF%BC%89%2B%EF%BC%88-3%EF%BC%89%2B1%2B%EF%BC%88-4%EF%BC%89%EF%BC%88-3%2F4%EF%BC%89%2B%EF%BC%88-2%2F3%EF%BC%89%2B%EF%BC%88-1%2F4%EF%BC%89%2B2%2F3+0.35%2B%EF%BC%88-0.6%EF%BC%89%2B0.25%2B%EF%BC%88-5.4%EF%BC%89%E8%BF%90%E7%94%A8%E5%8A%A0%E6%B3%95%E8%BF%90%E7%AE%97%E5%BE%8B%E7%AE%80%E5%8C%96%E8%AE%A1%E7%AE%97%EF%BC%9A%E4%BE%8B1%EF%BC%9A%E8%AE%A1%E7%AE%97%EF%BC%881%EF%BC%89%EF%BC%88-2%EF%BC%89%2B3%2B1%2B%EF%BC%88-3%EF%BC%89%2B2+%EF%BC%882%EF%BC%89%EF%BC%88-2.7%EF%BC%89%2B%EF%BC%88-4.5%EF%BC%89%2B%EF%BC%88%2B1)
递等式:13+(-15)+37+(-28) 3+(-1)+(-3)+1+(-4)(-3/4)+(-2/3)+(-1/4)+2/3 0.35+(-0.6)+0.25+(-5.4)运用加法运算律简化计算:例1:计算(1)(-2)+3+1+(-3)+2 (2)(-2.7)+(-4.5)+(+1
递等式:
13+(-15)+37+(-28) 3+(-1)+(-3)+1+(-4)
(-3/4)+(-2/3)+(-1/4)+2/3 0.35+(-0.6)+0.25+(-5.4)
运用加法运算律简化计算:
例1:计算
(1)(-2)+3+1+(-3)+2 (2)(-2.7)+(-4.5)+(+1.7)+6.5
(3)6分之1+(-7分之2)+(-6分之5)+(+7分之5)
拓展练习 计算:
(-36.35)+(-7.25)+26.35+(+7又4分之1)
(-3.5)+(-3分之4)+(-4分之3)+(+2分之7)+0.75+(-3分之7)
递等式:13+(-15)+37+(-28) 3+(-1)+(-3)+1+(-4)(-3/4)+(-2/3)+(-1/4)+2/3 0.35+(-0.6)+0.25+(-5.4)运用加法运算律简化计算:例1:计算(1)(-2)+3+1+(-3)+2 (2)(-2.7)+(-4.5)+(+1
递等式:
13+(-15)+37+(-28)
=13-15+37-28
=7
3+(-1)+(-3)+1+(-4)
=3-1-3+1-4
=-4
(-3/4)+(-2/3)+(-1/4)+2/3
=-3/4-1/4-2/3+2/3
=-1
0.35+(-0.6)+0.25+(-5.4)
=0.35+0.25-0.6-5.4
=0.6-0.6-5.4
=-5.4
运用加法运算律简化计算:
例1:计算
(1)(-2)+3+1+(-3)+2
=-2+2+3-3+1
=1
(2)(-2.7)+(-4.5)+(+1.7)+6.5
=(-2.7+1.7)+(-4.5+6.5)
=-1+2
=1
(3)6分之1+(-7分之2)+(-6分之5)+(+7分之5)
=(1/6-5/6)+(-2/7+5/7)
=-2/3+3/7
=-5/21
拓展练习 计算:
(-36.35)+(-7.25)+26.35+(+7又4分之1)
=(-36.35+26.35)+(-7.25+7.25)
=-10+0
=-10
(-3.5)+(-3分之4)+(-4分之3)+(+2分之7)+0.75+(-3分之7)
=(-3.5+7/2)+(-4/3-7/3)+(-3/4+0.75)
=0-11/3+0
=-11/3
13+(-15)+37+(-28)=7 3+(-1)+(-3)+1+(-4)= -4
(-3/4)+(-2/3)+(-1/4)+2/3 = -1 0.35+(-0.6)+0.25+(-5.4)= -5.5
(1)(-2)+3+1+(-3)+2 =((-2)+2)+(3+(-3))=0+0=0
(2)(-2.7)+(-4.5)+(+1.7)+...
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13+(-15)+37+(-28)=7 3+(-1)+(-3)+1+(-4)= -4
(-3/4)+(-2/3)+(-1/4)+2/3 = -1 0.35+(-0.6)+0.25+(-5.4)= -5.5
(1)(-2)+3+1+(-3)+2 =((-2)+2)+(3+(-3))=0+0=0
(2)(-2.7)+(-4.5)+(+1.7)+6.5=((-2.7)+(+1.7))+((-4.5)+6.5)=-1+2=1
(3)6分之1+(-7分之2)+(-6分之5)+(+7分之5)=(6分之1+(-6分之5))
+((-7分之2)+(+7分之5))=(-3分之2)+7分之3= -21分之5
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