请腊液采轮友物纳告蚂
24x29+12x42
解:禅判改简便计算
=12x2x29+12x42
=12x58+12x42
=12x(42+58)
=12x100
=1200
祝天天向上贺判。冲握
原式=12×58+12×42
=12×(帆野58+42)
=12×100
=1200
原友轿昌式好扒=32×(7+15)+44×34
=32×22+22×68
=22×(32+68)
=22×100
=2200
原式=12×2×29+12×42
=12×(58+42)
=12×100
=1200
24x29+12x42=
24x30-24+12x40+12x2=
24x30-24+24x20+24=
24x50=
12x100=
1200