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7.8+2.2x3.5用简便方法怎么做?

题目应为:3.5×7.8+2.2×3.5,否则不能进行简便计算, 3.5×7.8+2.2×3.5 =3.5×(7.8+2.2) =3.5×10 =35

先加减再乘除 22

7.8x3.5+22x0.35 =7.8x3.5+22÷10x0.35x10 =7.8x3.5+2.2x3.5 =(7.8+2.2)x3.5 =10x3.5 =35 首先算术里有共同是数就是3.5,再看看7.8+2.2=10,所以给后面的数字除以10在乘以10就相当于乘以1一样

(-0.8)+1.2+(-0.7)+(-2.1)+0.8+3.5 =(-0.8)+(-0.7)+(-2.1))+1.2+0.8+3.5 =-3.6+(1.2+0.8)+3.5 =-1.6+3.5 =1.9 祝你进步

8.7x3.5-2.2x3.5+6.5x6.5 =(8.7-2.2)×3.5+6.5×6.5 =6.5×3.5+6.5×6.5 =6.5×(3.5+6.5) =6.5×10 =65

2.2x0.22+7.8x2.2-4.4 =2.2×(0.22+7.8+2) =2.2×(10+0.02) =22+0.044 =22.044

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

2.8x3.7+8.2x3.7-3.27 =2.8x3.7+8.2x3.7-3.7+0.43 =3.7x(2.8+8.2-1)+0.43 =3.7x10+0.43 =37+0.43 =37.43

简便计算方法:7.8*(2.2+6.8+1)=78

8/15+7/15+2/7-5/7 =1-3/7 =4/7

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