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78.5X0.81+7.85x1.9的脱式计算

78.5X0.81+7.85x1.9 =63.585+14.915 =78.5

4/5x4+2/5x2+1/5x16 =16/5+4/5+16/5 =36/5 =7.2

参差荇菜,左右采之.窈窕淑女,琴瑟友之.

12.5x0.64x2.5 =(12.5x0.8)x(0.4x2.5x2) =10x2 =20

19.2÷2.4x3.2 =8×3.2 =25.6 12.5x0.33x0.5 =4.125×0.5 =2.0625 14.3÷1.1-18 =13-18 =-5 3.2x2.4+3.2x7.6 =3.2x(2.4+7.6) =3.2x10 =32

2.5x45x0.4 =2.5x0.4x45 =1x45 =45

12.5x9.6 =12.5x8x1.2 =100x1.2 =120 -----------------------------------------------------------------------------------------

2.65x1.7+13.5x0.17 =1.7*【2.65+1.35】 =1.7*4 =6.8 满意采纳

0。8x=0.12 3x+48=168 3x-x=156 3x+11=5x-5 3.8x=17.48 x÷6.7=19.43 3x+1.5x=135 100-5x=93 x+12.8=30 55-x=32.76 x÷70=4.9 5.6x=78.4 18x+21=48 8x-4x=56 3.6x+2.2x=63.8 2x+24=108(1)2x+8=16 (2)x/5=10 (3)x+7x=8 (4)9x-3x=6 (5)6x-8=4 (6)5x+...

23.5+76.5x0.25+0.75 =23.5x(0.25+0.75)+76.5x0.25+0.75 =23.7x0.25+23.5x0.75+76.5x0.25+0.75 =23.7x0.25+76.5x0.25+0.75+23.5x0.75 =(23.7+76.5)x0.25+0.75x(1+23.5) =100x0.25+0.75x24.5 =25+3/4x24.5 =25+18.375 =43.375 谢谢,请采纳

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