3.07×29＝89.03
3.07╳29=89.03 答，3.07剩以29等于89.03
3.07╳29=89.03原式=3.07×（30-1）=3.07×30-3.07×1=92.1-3.07=89.03
原式=3.07×（30-1）=3.07×30-3.07×1=92.1-3-0.07=89.1-0.07=88.03
