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6.5x7.8+3.5x2.2十3x2.2简便计算

=6.5*7.8+(3.5+3)*2.2 =6.5*7.8+6.5*2.2 =6.5*(7.8+2.2) =65 望采纳!!谢谢!

42.3x2.6+5.7x26 =z.6x(42.3+57+o.7一0.7) =2.6x100一2.6x0.7 =26o一1.82 =258.18

7.8x5.6+2.3x4.4=4x(7.8x1.6+2.3x1.1)=4x(12.48x2.53)=4x15.01=60.04 先乘除后加减 直接运算也是可以的

你好: 23x0.1+2.3x9.9 =2.3x1+2.3x99 =2.3x(99+1) =2.3X100 =230 如果满意记得采纳! 求好评! (*^__^*) 嘻嘻……

原式 =1x2x3(1+3+7)/[(1x3x5) (1+3+7)] =6/11

0.5+x)+x=9.8÷2 2(X+X+0.5)=9.8 25000+x=6x 3200=450+5X+X X-0.8X=6 12x-8x=4.8 7.5*2X=15 1.2x=81.6 x+5.6=9.4 52-x =15 91÷x =1.3 X+8.3=10.7 15x =3 3x-8=16 7(x-2)=2x+3 3x+9=2718(x-2)=270 12x=300-4x 7x+5.3=7.4 3x÷5=4.8 30÷x+25=8...

46x54十23x2 =46x54十46 =46x(54十1) =46x(50十5) =46x50+46x5 =2300+230 =2530

2.53x7.8 25.3x0.22简便计算用脱式计算要简便 2.53x7.8 +25.3x0.22 =2.53×(7.8+2.2) =2.53×10 =25.3

(1)去括号得:5x+40-5=12x-42,移项合并得:7x=77,系数化为1得:x=11;(2)去分母得:15-9x=6-10x,移项合并得:x=-9.

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