Question

5.8×2.8+46+0.28=？简便计算

Answer 1

5.8×2.8+46+0.28=？简便计算

5.8×2.8+46+0.28
=2.8×（5.8+4.6）
=28

简便计算0.28*56+3.4*2.8+2.8

0.28*56+3.4*2.8+2.8
=0.28*10*5.6+3.4*2.8+2.8
=2.8*（5.6+3.4+1）
=2.8*10
=28

简便计算74×0.28-0.4×2.8

简便计算74×0.28-0.4×2.8
74×0.28-0.4×2.8
=74*0.28-4*0.28
=0.28*（74-4）
=0.28*70
=19.6

2.8×0.75 0.28×2.5的简便计算

2.8×0.75+ 0.28×2.5
=(0.75+0.25)x2.8
=2.8
或者：
2.8×0.75- 0.28×2.5
=(0.75-0.25)x2.8
=0.5x2.8
=1.4

0.46×2.8+5.4×0.28简便计算

2.8

• 解析：

0.46×2.8+5.4×0.28

=0.46×2.8+0.54×2.8

=(0.46+0.54)×2.8

=1.00×2.8

=2.8

76x0.28 3.4x0.28-2.8简便计算

3.4×2.8+66×.28=3.4×2.8+6.6×2.8=2.8×(3.4+6.6)=2.8×10=28因为乘法计算小数点和末尾的零都可以交换,

3.4乘2.8+66乘0.28简便计算

=3.4×2.8+6.6×2.8
=（3.4+6.6）×2.8
=10×2.8
=28

2.8×8.6 0.28×25-0.028×110简便计算

原式
=2.8x8.6+0.28x25-0.028x110
=2.8x8.6+2.8x2.5-2.8x1.1
=2.8x(8.6+2.5-1.1)
=2.8x(11.1-1.1)
=2.8x10
=28

5.8-2.8×(2.5-1.8)简便计算

5.8-2.8×(2.5-1.8)简便计算
=5.8-2.8×0.7
=5.8-1.96
=3.84
直接算

2.8乘以10.1减0.28用简便计算

2.8乘以10.1减0.28用简便计算
2.8乘以10.1减0.28
=2.8*10.1-2.8*0.1
=2.8*（10.1-0.1）
=2.8*10
=28