Question

简便方法计算，4.6×2.8+2.8×5.4 4×8×2.5×12.5 1.25×

简便方法计算，4.6×2.8+2.8×5.4 4×8×2.5×12.5 1.25×49+1.25 1.5×104

Answer 1

4.6×2.8+2.8×5.4
=(4.6+5.4)×2.8
=10×2.8
=28
4×8×2.5×12.5
=4×2.5×(8×12.5)
=10×100
=1000
1.25×49+1.25
=1.25×(49+1)
=1.25×50
=62.5
1.5×104

=1.5×(100+4)
=1.5×100+1.5×4
=150+6
=156

Answer 2

4.6×2.8+2.8×5.4
=2.8（4.6+5.4）
=2.8x10
=28
4×8×2.5×12.5
=(4x2.65)x(8x12.5)
=10x100
=1000
1.25×49+1.25
=61.25+1.25
=62.5
1.5×104=156

Answer 3

2.8*（4.6+5.4）=28

（4*2.5）*（8*12.5）=1000

1.25*（49+1）=62.5

1.5*（100+4）=156

Answer 4

2.8*（4.6+5.4）=2.8*10=28
4*2.5*（8*12.5）=10*100=1000
1.25*（49+1）=1.25*50=62.5
1.5*（100+4）=1.5*100+1.5*4=150+6=156

Answer 5

四点6×2点8+2点8×5点4=6点五