The problem of rational number multiplication (negative 5) multiply by 3 and 3 / 1 plus 2 multiply by 3 and 3 / 1 plus (negative 6) multiply by 3 and 3 / 1

The problem of rational number multiplication (negative 5) multiply by 3 and 3 / 1 plus 2 multiply by 3 and 3 / 1 plus (negative 6) multiply by 3 and 3 / 1

(negative 5) multiply by 3 and 3 / 1 plus 2 multiply by 3 and 3 / 1 plus (negative 6) multiply by 3 and 3 / 1
=(-5)*(10/3+2*10/3+(-6)*10/3
=10/3*(-5+2-6)
=10/3*(-9)
=-30

Simple calculation: 999.9 + 99.9 + 9.9 + 0.9497-97 * 3 + 37 6.92-11 / 8-11 / 3 + 3.18 9 / 4 × [0.75 - (7 / 16-0.25)]
1.32 × 5 / 8 + 2.68 △ 1.6

999.9+99.9+9.9+0.9
=(1000-0.1)+(100-0.1)+(10-0.1)+(1-0.1)
=1000+100+10+1-0.1*4
=1111-0.4
=1110.6
497-97*3+37
=(497-97)-(100-3)*2+37
=400-100*2+2*3+37
=200+6+37
=243
6.92-8/11-3/11+3.18
=(6.92+3.18)-(8+3)/11
=10.1-1
=9.1
4/9×[0.75-(7/16-0.25)]
=4/9*[(0.75+0.25)-7/16]
=4/9*9/16
=1/4
1.32×5/8+2.68÷1.6
=6.6/8+13.4/8
=(6.6+13.4)/8
=20/8
=2.5

999.9 + 99.9 + 9.9 + 0.9 =? Simple method

999.9+99.9+9.9+0.9
=1000-0.1+100-0.1+10-0.1+1-0.1
=1111-0.4
=1110.6

34 × 52 + 34 × 47 + 34 with simple method

34×52+34×47+34
=34（52+47+1）
=34*100
=3400