6.93*99+6.93 12.5*3.4*0.8 4.36*99+4.36 8.7*9.9 2.5*32*0.125 全部用简便运算

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6.93*99+6.93 12.5*3.4*0.8 4.36*99+4.36 8.7*9.9 2.5*32*0.125 全部用简便运算
6.93*99+6.93 12.5*3.4*0.8 4.36*99+4.36 8.7*9.9 2.5*32*0.125 全部用简便运算

6.93*99+6.93 12.5*3.4*0.8 4.36*99+4.36 8.7*9.9 2.5*32*0.125 全部用简便运算
6.93*99+6.93
=6.93*(99+1)
=6.93*100
=693
12.5*3.4*0.8
=12.5*0.8*3.4
=10*3.4
=34
4.36*99+4.36
=4.36*(99+1)
=4.36*100
=436
8.7*9.9
=8.7*(10-0.1)
=87-0.87
=86.13
2.5*32*0.125
=2.5*4*8*0.125
=10*1
=10

6.93*99+6.93
=6.93*(99+1)=6.93*100=693
12.5*3.4*0.8=12.5*0.8*3.4=100*3.4=340
4.36*99+4.36=4.36*(99+1)=4.36*100=436
8.7*9.9=8.7*10-8.7*0.1=87-0.87=86.13
2.5*32*0.125 =2.5*(30+2)*0.125=(75+5)*0.125=80*0.125=10

6.93*99+6.93
=6.93×(99+1)
=6.93×100
=693
12.5*3.4*0.8
=10×3.4
=34
4.36*99+4.36
=4.36×(99+1)
=4.36×100
=436
8.7*9.9
=8.7×(10-0.1)
=8.7×10-8.7×0.1
=87-0.87
=86.13
2.5*32*0.125
=2.5×4×8×0.125
=10×1
=10

6.93*99+6.93=6.93*(99+1)=6.93*100=693
12.5*3.4*0.8=(12.5*0.8)*3.4=10*3.4=34
4.36*99+4.36=4.36*(99+1)=4.36*100=436
8.7*9.9=8.7*(10-0.1)=8.7*10-8.7*0.1=87-0.87=86.13
2.5*32*0.125=(2.5*4)*(8*0.125)=10*1=10