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7.8+2.2x3.5用简便方法怎么做?

=3.5*0.78+3.5*2.2 =3.5*(0.78+2.2) =3.5*2.98=3.5*(3-0.02) =3.5*3-3.5*0.02 =10.5-0.07 =10.43 如果是7.8,那就简单了 =3.5*(7.8+2.2) =3.5*10 =35

7.8*0.37+2.2*0.37=(7.8+2.2)*0.37=10*0.37=3.7

7.8+2-7.8+2 =(7.8-7.8)+(2+2) =0+4 =4 分配法

4.7x7.8十2.2x4.2用简便方法计算 4.7x7.8十2.2x4.2 =4.2*(7.8+2.2)+7.8*0.5 =42+3.9 =45.9

2.3x7.8+9.9x7.7+2.3x2.1 =2.3×(7.8+2.1)+9.9×7.7 =2.3×9.9+9.9×7.7 =(2.3+7.7)×9.9 =10×9.9 =99

7.8-7.5+2.2-2.5=(7.8+2.2)-(7.5+2.5)=10-10=0

=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!

解:5.3*7.8+2.2*5.3 =5.3*(7.8+2.2) =53

您好,寒樱暖暖为你解答: 原式 =7.2×8.2+7.2×1.8 =7.2×(8.2+1.8) =7.2×10 =72 如果你认可我的回答, 请及时点击【采纳为满意回答】按钮, (或在客户端右上角评价点【满意】) 你的采纳, 是我前进的动力! 如有不明白, 可以追问,直到完成弄...

7.8x1.4+7.8x2.6+7.8x3.5+7.8×2.5 =7.8x(1.4+2.6+3.5+2.5) =7.8x10 =78

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