168×70-68×70
=70×(168-68)
=70×100
=7000
425-168+68
=425-168+68
=425-(168-68)
=425-100
=325
希望帮到你 望采纳 谢谢 加油
4/70乘25乘68的积,简便运算
=2/35x25x68
=10/7x68
=680/7
这道题这样简便计算…利用乘法结合律,(354-54)×70=21000,就是这样写…
10*7/4*7=2.5
70+104x70
=70x(1+104)
=70x100+70x5
=7000+350
=7350
70×89+11×70
=70×(89+11)
=70×100
=7000
4.4×70×1.5
=4x1.1×70×1.5
=4x1.5×70×1.1
=6×70×1.1
=420x(1+0.1)
=420+420x0.1
=420+42
=462
520—(70+28×2)
=520-(70+56)
=520-126
=520-120-6
=400-6
=394
7000-350+350