How to calculate 7.8 × 5.4 + 0.78 + 78 × 0.45?

How to calculate 7.8 × 5.4 + 0.78 + 78 × 0.45?

7.8×5.4+0.78+78×0.45 =0.78*(54+1+45)=0.78*100=78

78 × 36 + 7.8 × 741-7 and 4 / 5

78 × 36 + 7.8 × 741-7 and 4 / 5
=78×36＋7.8×741－7.8
=7.8*（360+741-1）
=7.8*1100
=7.8*1000+7.8*100
=7800+780
=8580

3 out of 8 + (4 out of 7 + 5 out of 8) what can be calculated simply should be calculated simply

3 / 8 + (4 / 7 + 5 / 8)
=3 / 8 + 4 / 7 + 5 / 8
=3 / 8 + 5 / 8 + 4 / 7
=1 + 4 / 7
=1 and 4 / 7

Simple calculation of 36 * 111 + 8888 * 8 7 / 4 * 5 / 3 + 7 / 2 * 5 / 4

36*111+888*8=36*111+8*8*111=（36+64）*111=11100
4 / 7 * 3 / 5 + 2 / 7 * 4 / 5
=2 * 7 / 2 * 5 / 3 + 7 / 2 * 5 / 4
=2 out of 7 * 6 out of 5 + 2 out of 7 * 4 out of 5
=2 out of 7 * (6 out of 5 + 4 out of 5)
=2 / 7 * 2
=4 out of 7

45×7.4−45+3.6×0.8．

45×7.4−45+3.6×0.8，=0.8×7.4-0.8+3.6×0.8，=0.8×（7.4-1+3.6），=0.8×10，=8．