mshd.net
当前位置:首页 >> 4.2x7.8+2.2x4.2简便计算 >>

4.2x7.8+2.2x4.2简便计算

呃呃。。。

4.2x7.8+2.2x4.2 =(7.8+2.2)*4.2 =10*4.2 =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

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

=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

=4.2x(7.8+2.2) =4.2x10 =42 请采纳

原式=4.2*7.8+4.2*2.2=4.2*(7.8+2.2)=4.2*10=42

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.

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

网站首页 | 网站地图
All rights reserved Powered by www.mshd.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com