2.4乘以0.19加0.24乘8.1用简便方法怎么计算?
2.4乘以0.19加0.24乘8.1用简便方法怎么计算?
2.4*0.19+0.24*8.1
=2.4*0.19+2.4*0.81
=2.4*(0.19+0.81)
=2.4*1
=2.4
注:相当于乘法时,前后两项同时乘以10,同时除以10;即前一项小数点后移一位,后一项小数点前移一位,大小不变
2.4乘0.19+0.24乘8.1用简便方法计算
2.4*0.19+0.24*81=2.4*0.19+2.4*8.1=2.4*(0.19+0.81)=2.4
99乘以0.24加76乘以0.99用简便方法计算
99×0.24 + 76 ×0.99
= 99×0.24 + 0.76×99
= 99 ×(0.24 + 0.76)
= 99× 1
= 99
2.4乘1.9加0.24乘8.1的简便计算
2.4 x 1.9 + 0.24 x 8.1
= 2.4 x (1.9 + 0.1 x 8.1)
= 2.4 x (1.9 + 0.81)
= 2.4 x 2.71
= 6.504
如果是:2.4 x 1.9 + 0.24 x 81
= 2.4 x 1.9 + 2.4 x 8.1
= 2.4 x (1.9 + 8.1)
= 2.4 x 10
= 24
2.4乘以1.1用简便方法怎么计算
2.4x(1+0.1)然后用分配律
2.4乘以4.8 22乘以0.24的简便方法
2.4×4.8+22×0.24
=0.24×48+22×0.24
=0.24×(48+22)
=0.24×70
=16.8
简算2.4乘0.19加0.24乘8.1
解:
2.4乘0.19加0.24乘8.1
=0.24×1.9+0.24×8.1
=0.24×(1.9+8.1)
=0.24×10
=2.4
51乘以13加13乘以49用简便方法计算怎么算?
解:原式=51*13+13*49
=13*(51+49)
=13*100
=1300
18乘以260加820乘以26用简便方法计算怎么算
18×260+820×26
=18×260+82×10×26
=260×(18+82)
=260×100
=26000
=180x26+820x26
=26x(180+820)
=26x1000
=26000