解:43x12+42x8=43x12+(42+1-1)x8=43x12+43x8-8=43x(12+8)-8=852
可以多种简便,其一:
=43×(10+2)+42×(10-2)
=430+86+420-84
=850+2
=852
43×12+42×8
=(42+1)×12+42×8
=1×12+42×12+42×8
=12+(12+8)×42
=12+20×42
=12+840
=852
43✖️12➕42✖️8
=42x(12+8) +12
=42x20+12
=840+12
=852
42×12+42×8
=42×(12+8)
=42×20
=840