大哥哥大姐姐教教我(初一内容,要简便运算,-8+(-5又3/5)-(-7)-(-2又1/5) -28-(-35)-(+12)+(-25)(-2.5)*1.25*(-8)*(-4) (-5/6+3/4-2又1/2+5/12)*(-36)-99又11/12*36 0.7*(-10)+(-7)*3+(-0.07)*800(+17
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![大哥哥大姐姐教教我(初一内容,要简便运算,-8+(-5又3/5)-(-7)-(-2又1/5) -28-(-35)-(+12)+(-25)(-2.5)*1.25*(-8)*(-4) (-5/6+3/4-2又1/2+5/12)*(-36)-99又11/12*36 0.7*(-10)+(-7)*3+(-0.07)*800(+17](/uploads/image/z/5906304-0-4.jpg?t=%E5%A4%A7%E5%93%A5%E5%93%A5%E5%A4%A7%E5%A7%90%E5%A7%90%E6%95%99%E6%95%99%E6%88%91%28%E5%88%9D%E4%B8%80%E5%86%85%E5%AE%B9%2C%E8%A6%81%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%2C-8%2B%EF%BC%88-5%E5%8F%883%2F5%EF%BC%89-%EF%BC%88-7%EF%BC%89-%EF%BC%88-2%E5%8F%881%2F5%EF%BC%89+-28-%28-35%29-%28%2B12%29%2B%28-25%29%EF%BC%88-2.5%EF%BC%89%2A1.25%2A%EF%BC%88-8%EF%BC%89%2A%EF%BC%88-4%EF%BC%89+%EF%BC%88-5%2F6%2B3%2F4-2%E5%8F%881%2F2%2B5%2F12%EF%BC%89%2A%EF%BC%88-36%EF%BC%89-99%E5%8F%8811%2F12%2A36+0.7%2A%EF%BC%88-10%EF%BC%89%2B%EF%BC%88-7%EF%BC%89%2A3%2B%EF%BC%88-0.07%EF%BC%89%2A800%28%2B17)
大哥哥大姐姐教教我(初一内容,要简便运算,-8+(-5又3/5)-(-7)-(-2又1/5) -28-(-35)-(+12)+(-25)(-2.5)*1.25*(-8)*(-4) (-5/6+3/4-2又1/2+5/12)*(-36)-99又11/12*36 0.7*(-10)+(-7)*3+(-0.07)*800(+17
大哥哥大姐姐教教我(初一内容,要简便运算,
-8+(-5又3/5)-(-7)-(-2又1/5) -28-(-35)-(+12)+(-25)
(-2.5)*1.25*(-8)*(-4) (-5/6+3/4-2又1/2+5/12)*(-36)
-99又11/12*36 0.7*(-10)+(-7)*3+(-0.07)*800
(+17又3/4)-(+6.25)-(-8又1/2)-(+0.75)-22又1/4
大哥哥大姐姐教教我(初一内容,要简便运算,-8+(-5又3/5)-(-7)-(-2又1/5) -28-(-35)-(+12)+(-25)(-2.5)*1.25*(-8)*(-4) (-5/6+3/4-2又1/2+5/12)*(-36)-99又11/12*36 0.7*(-10)+(-7)*3+(-0.07)*800(+17
-8+(-5又3/5)-(-7)-(-2又1/5)
=-8-(-7)+(-5又3/5)-(-2又1/5)………交换位置
=【(-8)+(+7)】+【(-5又3/5)+2又1/5】
=(-1)+(-3又2/5)
=-4又2/5
-28-(-35)-(+12)+(-25)
=【(-28)+(-12)】-【(-35)+(+25)】
=(-40)-(-10)
=(-40)+(+10)
=(-30)
(-2.5)×*1.25×(-8)×(-4)
=【(-2.5)×(-4)】×【(1.25×(-8)】………乘法交换律和结合律
=10×(-10)
=(-100)
(-5/6+3/4-2又1/2+5/12)×(-36)………乘法分配率
=(-5/6)×(-36)+3/4×(-36)-2又1/2×(-36)+5/12×(-36)
=30-27+90-15
=(30+90)-(27+15)
=120-42
=78
-99又11/12*36
=(-1)×【99+11/12】×36………变一变,就简便.
=(-1)×【100-1+11/12】×36
=(-1)×【100×36-1×36+11/12×36】………乘法分配律
=(-1)×(3600-36+33)
=(-1)×3597
=-3597
0.7×(-10)+(-7)×3+(-0.07)×800………变一变,就简便.
=(-7)-7×3-7×8
=(-7)×(1+3+8)
=(-7)×12
=-84
(+17又3/4)-(+6.25)-(-8又1/2)-(+0.75)-22又1/4
=【(+17又3/4)-(+0.75)】)-【(+6.25)+22又1/4+8又1/2】
=17-37
=(-27)
-8+(-5又3/5)-(-7)-(-2又1/5)
=-8 - 5又3/5 + 7 + 2又1/5
=-8 + 7 - 5又3/5 + 2又1/5
=-1 - 3又2/5
=- 4又2/5
-28-(-35)-(+12)+(-25)
=28+35-12-25
=28-12+35-25
=16+10
=26
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-8+(-5又3/5)-(-7)-(-2又1/5)
=-8 - 5又3/5 + 7 + 2又1/5
=-8 + 7 - 5又3/5 + 2又1/5
=-1 - 3又2/5
=- 4又2/5
-28-(-35)-(+12)+(-25)
=28+35-12-25
=28-12+35-25
=16+10
=26
(-2.5)*1.25*(-8)*(-4)
=(-2.5)*(-4)*1.25*(-8)
=(-10)*(-10)
=100
(-5/6+3/4-2又1/2+5/12)*(-36)
=(-5/6)*(-36)+(-5/2)*(-36)+(5/12)*(-36)
=30+90-15
=105
-99又11/12*36
=(-100+1)*36+(-11/12)*36
=-3600+36-33
=3600+3
=3603
0.7*(-10)+(-7)*3+(-0.07)*800
=7*(-1-3-8)
=7*(-12)
=-84
(+17又3/4)-(+6.25)-(-8又1/2)-(+0.75)-22又1/4
=17又3/4-6又1/4+8又2/4-3/4-22又1/4
=17-6+8-22+3/4-1/4+2/4-3/4-1/4
=-3
收起