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6x 51+19 简便运数

6乘(51加19)的简便运算6乘(51加19)=6*70=420直接计算即可

是72÷6x(51+19)=?吗, 第一步:51+19=70,第二步:6x(51+19)=6x70=420 第三步:72÷6x(51+19)=72÷420=6/35 即0.1714.

3606x51+287=60x51+287=3060+287=3060+300-10-3=3360-10-3=3350-3=3347

4.6+ 48x4.6-4.6x51=4.6x(1+48-51)=4.6x(-2)=-9.2

6x18+9x12=6x2x9+9x12=12x9+9x12=12x9x2=216

6x38-27x6+6x19=6x(38-27+19)=6x(11+19)=6x30=180

额……=3Ⅹ11Ⅹ3Ⅹ11Ⅹ8+3Ⅹ11Ⅹ9=11Ⅹ(3Ⅹ3Ⅹ8+3Ⅹ9)=11Ⅹ99=1089

解方程1:X*2+5=152:6X+5=113:X-0.8X=64:19y+y=40 5:25-5x=15 6:79y+y=80 7:42x+28x=140 8:3x-1=8 9: 90y-90=90 10: 80y-90=7011: 78y+2y=160 12: 88-x=80 13: 9-4x=114: 20x=40 15: 65y-30=100 16: 51y-y=100 17: 6X-3X=18 18: 1.5x+18=3x

.125*3+125*5+25*3+25 2.9999*3+101*11*(101-92) 3.(23/4-3/4)*(3*6+2) 4. 3/7 * 49/9 - 4/3 5. 8/9 * 15/36 + 1/27 6. 12* 5/6 2/9 *3 7. 8* 5/4 + 1/4 8. 6÷ 3/8 3/8 ÷6 9. 4/7 * 5/9 + 3/7 * 5/9 10. 5/2 -( 3/2 + 4/5 ) 11. 7/8 + ( 1/8 + 1/9 ) 12. 9 * 5/6 + 5/6

102* 98= 45.55-(6.82+15.55)= 9.83*1.5+10.17*1.5=99* 101= 23.75-8.64-3.46 = 14.63-7.85-2.15 =125 *4.8= 8*0.4*12.5*2.5 = 3.7*102 =99*1.01= 0.456+6.22+3.78 =78+100+22= 15.89+(6.75-5.89)= 4.02+5.4+0.98 =125 4.8 25= 0.79*0.5*20=

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