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4.2x7.8+2.2x4.2简便计算

呃呃。。。

6*0.7 * 6* 1.3 +2.2 将4.2也可以化作42*0.1 就是将两位数化作一位数和多位数相乘 快速 准确 做题作准确才有 分数 =6*6*0.91+2.2 =6*5.46+2.2 =32。76+2.2 = 相信你已经会了

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

4.2×7.8+2.2×4.2 =4.2×(7.8+2.2) =4.2×10 =42

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

4.2×7.8+4.2×2.2 =4.2×(7.8+2.2) =4.2×10 =42

7.8×10.2 =7.8x10+7.8x0.2 =78+1.56 =79.56 请好评 ~在右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了。 如果你认可我的回答,敬请及时采纳, ~你的采纳是我前进的动力~~

0.87x(3.36+4.64)

1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9 =2×(1+3)+4×(3+5)+6×(5+7)+8×(7+9) =2×2×2+4×4×2+6×6×2+8×8×2 =4×2+16×2+36×2+64×2 =2×(4+16+36+64) =2×120 =240 故答案为:240.

8.8x=2.2 x=2.2/8.8 x=0.25

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