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4.2x7.8+2.2x4.2简便计算

呃呃。。。

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

4.2x7.8十2.2x4.2 =4.2x(7.8+2.2) =4.2x10 =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

0.87x(3.36+4.64)

7.8x0.6+2.2简便计算 =4.68+2.2 =6.88 不能简便

利用2×(3.9+7.8×2)。

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

7.8x(199.8+0.2) =7.8x200 =1560

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