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6.5x7.8+3.5x2.2十3x2.2简便计算

7.8X5.6+2.3X4.4 7.8X(10-4.4)+2.3X4.4 =7.8X10-7.8X4.4+2.3X4.4 =78-5.5X4.4 =78-(5+0.5)(4+0.4) =78-5X4-5X0.4-0.5X4-0.5X0.4 =78-20-2-2-0.2 =53.8 这个是正确答案

3X+5X=48 14X-8X=12 6*5+2X=44 20X-50=50 28+6X=88 32-22X=10 24-3X=3 10X*(5+1)=60 99X=100-X X+3=18 X-6=12 56-2X=20 4y+2=6 x+32=76 3x+6=18 16+8x=40 2x-8=8 4x-3*9=29 8x-3x=105 x-6*5=42 x+5=7 2x+3=10 12x-9x=9 6x+18=48 56x-50x=30 5x...

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

两边同乘以5 3x-2+10=x+6 移项 3x-x=6+2-10 2x=-2 x=-1

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