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急急急,急求七年级数学有理数加减乘除乘方混合运...

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初一数学有理数的混合运算练习 练习一(B级) (一)计算题: (1)23+(-73) (2)(-84)+(-49) (3)7+(-2.04) (4)4.23+(-7.57) (5)(-7/3)+(-7/6) (6)9/4+(-3/2) (7)3.75+(2.25)+5/4 (8)-3.75+(+5/4)+(-1.5) (二)用简便方法计算: (1)(-17/4)+(-10/3)+(+13/3...

解析: (3+3²+3³)÷(1/2+1/6+1/12) =39÷(6/12+2/12+1/12) =39÷(9/12) =39÷(3/4) =52

原式=18-(-3)×(-1/3) [(-3)^2-(-5)^2]÷(-2)原式=(9-25)÷(-2) (-2)^3×0.5-(-1.6)^2÷(-2)^2原式=(-8)×(1/2)-(-8/5)^2÷4 (-3/4)×(-8+2/3-1/3)原式=(-3/4)×(-8+1/3) 16÷(-2)^3-(-1/8)×(-4)原式=16÷(-8)-1/2

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3 2^2×(-1/5) 解:原式=3 4×(-1/5) =3-4/5 =11/5 18-6÷(-2)×(-1/3) 解:原式=18-(-3)×(-1/3) =18-1 =17 (-3)^2×[-2/3 (-5/9)] 解:原式=9×(-11/9) =-11 8 (-3)^2×(-2) 解:原式=8 9×(-2) =8-18 =-10 100÷(-2)^2-(-2)÷。

有理数实践 练习计算题: (1)(B级) (A)23 +(-73)(2)(-84)+(-49)(3)7 +(-2.04)(4)4.23 +(-7.57)(5)(-7 / 3)+(-7 / 6)(6)9/4 +(3/2)(7)3.75 +(2.25) 5/4(8)-3.75 +(5/4)+(-1.5) (二)最简单的方式: ...

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